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The Real Housewives of Beverly Hills star has revealed that two of her children - Bella, 18 and Anwar, 16 - were diagnosed with chronic Lyme disease in early 2012.
Yolanda herself contracted the tick-borne illness and has since been open about her battle.
While being honoured at the Global Lyme Alliance Gala in New York, the 51-year-old paid tribute to her children.
She promised that she will not allow them to live a life of pain.
During her tearful acceptance speech she said: "Watching my babies struggle in silence in order to support me in my journey, struck the deepest core of hopelessness inside of me."
"I will walk to the end of the earth to find a cure so that you can live a healthy life that you deserve."
Image captionBella with her family, sister Gigi, brother Anwar and mum Yolanda
Eldest daughter Gigi, 20, spoke on her mother using her RHOBH fame to spread awareness.
"She was honest, unapologetic, and raw in how she portrayed Lyme disease on social media and on the show from the second she announced to the world she had been diagnosed."
According to the NHS, there are up to 3,000 new cases of Lyme disease detected each year across England and Wales.
What is Lyme disease?
Lyme disease occurs when a tick - infected with bacteria from biting certain animals - then bites into the skin of a human.
Most commonly found in woodland and heath areas, the tick is more likely to infect you if attached to your skin for more than 24 hours.
Image captionLyme disease can be contracted when an infected tick bites into your skin and starts feeding on your blood
What are the symptoms?
In many people the earliest symptom of Lyme disease would be a distinctive circular rash similar to that of a bull's-eye on a dart board.
I will walk to the end of the earth to find a cure
Yolanda Foster
However, one in three people with Lyme disease won't develop this rash.
Other symptoms include those similar to flu such as fatigue, muscle pain, joint pain, headaches, fever, chills and neck stiffness.
More serious symptoms which may develop, if left untreated, include problems affecting the nervous system, pain and swelling in the joints, and heart problems.
Can it be treated?
The NHS website says that Lyme disease can often be treated effectively if it's detected early on.
Most people will be given a course of antibiotics to take over a two-to-four week course. If symptoms are particularly severe they may be required to be administered via. injection.
There is currently no vaccine to prevent contracting the illness.
The celeb condition?
Image captionAshley Olsen (right) has reportedly battled with the illness
Yolanda Foster and her family are not the only celebrities suffering with this chronic disease.
famously spoke out about her diagnosis earlier this year.
Although you wouldn't necessarily link red carpet stars to woodland areas... reportedly, Ashley Olsen, Richard Gere, Ben Stiller, Christy Turlington and Alec Baldwin have all battled with the illness too.
That affects many parts of the body, including the skin, joints and internal organs.
Signs and symptoms
Lots of people can have the condition for a long time without knowing before they get a sudden flare-up.
The symptoms include extreme tiredness, rashes (especially on the face, wrists and hands) and joint pain and swelling.
Even mild cases can be distressing and have a big impact on quality of life.
But the symptoms can be similar to more common conditions so it's often hard to diagnose.
SLE can put some people at greater risk of complications like infections, heart attacks or strokes.
Around 90% of those affected are women and it's most common in those between 15 and 50
NHS
Steph Tovey, who's 23, started getting symptoms around April 2011. She hadn't heard of the condition until she was diagnosed and had to take three months off work.
"I was really very unwell, I was on a lot of medications. Now day to day [it's] not so bad but I do still suffer. I get little aches and pains," she says.
"The fatigue is the biggest issue, no matter how much you rest, you don't feel better for it."
She says it's a massive deal that Selena has publicly announced her illness and says it must be really hard for her.
"It's is quite an unknown condition so the awareness that is raised is a massive deal to those of us who suffer from it."
"Sometimes you don't even want to get out of bed, let alone touring round and standing on stage, that would be a lot of energy that some days you really don't have."
Image captionRachel says Lupus means sometimes she "can't even put socks on"
Meanwhile, Rachel Warburton has told Newsbeat doctors thought it was a cold when she first got the symptoms.
"My joints started flaring up so I got really swollen joints a lot of pain. I couldn't even stand up.
"It has affected my day-to-day life in that I to have to take care of myself, there's things I can't do. I have to cancel plans quite a lot if I'm sick."
She's also got a lot of understanding for Selena's situation.
"Sometimes I can't get out of bed, let alone have a camera in my face every five minutes".
What causes lupus?
Image captionSelena Gomez appeared in Radio 1's Live Lounge last month
In the most sever form of lupus, the immune system starts to attack and inflame healthy cells, tissue and organs.
It's not known why it happens but it's thought it's often down to a combination of genetic and environmental factors.
It's a rare condition and is thought to affect around 15,000 people in England and Wales.
Around 90% of those affected are women and it's most common in those between 15 and 50.
It's more common in people of African, Caribbean or Asian ethnicity.
How do you treat it?
At the moment there's no cure for SLE but treatments have got much better, with drugs to help with the symptoms and reduce the risk of organ damage.
Chemotherapy can sometimes be used to suppress the immune system - that's a mixture of drugs.
A few decades ago SLE was seen as a terminal condition, with many people dying from complications within a few years of diagnosis
Natural cosmetic company, Lush, is defending its adverts after complaints they were "pornographic".
The Go Naked campaign shows naked employees, with a banner reading: "We prefer to go naked. Like over 100 of our products."
The adverts, which appeared in stores across Australia, received four complaints to the country's Advertising Standards Board (ASB).
Lush said customers had described the posters as "inspirational".
But the complaints claimed they were "offensive" with posters at eye level for children.
One read: "It is pornographic in nature and breaches community and parental standards of what should be involuntarily viewed in public by children and adults.
"It was placed at a child's eye level in a shopping centre. It shows naked women touching other naked women and it is shown in a public place.
"I am offended as this is nudity for the sake of causing a stir and is offensive [sic] and unnecessary."
Image captionThe company tries to promote package-less products
The ABS upheld the complaints saying: "The Board considered that the advertisement does not treat the issue of sex, sexuality and nudity with sensitivity to the relevant broad audience which would include children and determined that the advertisement did breach Section 2.4 of the Code."
The retailer has removed the ads from its Queensland store.
A Lush spokesperson defended the campaign, saying: "Some of our customers told us that after years of struggling with their own bodies, they were inspired."
She said people were generally glad not to see an image of "a photoshopped, idealised version of beauty they may not meet".
"The majority of critical feedback that we received was from people who were concerned about the effect on children."
Justin Bieber's legal team is demanding that media websites who have published naked photos of the star remove them immediately.
The Hollywood Reporter claims to have seen a lawyer's letter sent to the New York Daily News, which originally published the pictures of the star on holiday in French Polynesia.
The photos of the singer in Bora Bora are still live on the US website.
The legal document is demanding action within 12 hours of receipt.
The legal cease and desist letter also acknowledges the photos are of Bieber, despite speculation the photos had been doctored to look like him.
"We recently became informed that your company has obtained and is distributing unauthorised photographs of our client including images showing him without clothing," reads the letter.
Bieber's legal team says the publication of the photos represent a breach of the singer's publicity and privacy rights.
The photos also, according to the letter, infringe Bieber's trademarks.
The singer's representatives at the Myman Greenspan law firm are believed to be threatening to sue if the photos aren't taken down.
Video captionCan #FindAzam help to discover the whereabouts of a young Syrian refugee?
Unicef says 110,000 children asked for asylum in Europe in the first six months of this year.
In the chaos, many get split up from their families.
Others make the dangerous journey alone and their parents are now desperately trying to find them.
Many are using Facebook to help the search. Here are some of the faces of the missing...
Image captionThese brothers from Afghanistan, Jawde (14) and Selha (8) lost their parents in Macedonia during the fight between police and refugees. The family wanted to go in Germany. Their father's name is Golmsakie
Special Facebook groups have been set up in places like Greece, which is where so many refugees first arrive.
The photos are posted by families and also charities and volunteers who are trying to help the refugees.
Image captionThe message next to this photo says: Alaa Riyadh (from Iraq) was travelling with her daughter Aaya Aqeel (13) and her sons Ahmed Aqeel (11) and Sajjad Aqeel (7). Their boat capsized near the Greek island of Samos, and Alaa Riyadh was rescued by the Greek Coastguard. They have now been missing since 12 September and there's no news
The Missing Children Europe federation says up to half of the unaccompanied children placed in certain European reception centres vanish within 48 hours.
The federation claims some run away, while others fall victim to kidnapping, trafficking and sexual exploitation.
Image captionAlali Hassan has been looking for his three children for a year. He lost them in Serbia. Their names, from left to right are Araz Abdallah (5) Masud Abdallah (10) and Rama Abdallah (5)
Image captionThis boy is missing in Hungary. The message next to this photo simply says: "This boy lost his family last night at Nyugati station last night. He's now in Nyugati transit zone
Just occasionally, there is the odd ray of hope. Look at the last comment on the right hand side...
On Wednesday, the three countries worst affected by Ebola - Guinea, Sierra Leone and Liberia - recorded their first week with no new cases since the outbreak began in March 2014.
The programme had aimed to train and equip 5,400 fighters this year and a further 15,000 in 2016.
A senior administration official said the programme was being put on "pause" and said it could be restarted in future.
The programme had suffered from "significant challenges", the official said, adding: "We had a very high bar in terms of recruiting".
The US will no longer vet every individual recruit but just the leaders of the groups they decide to work with, who will face "very vigorous vetting".
Of the initial two groups sent into the country under the previous programme, the first was rounded up by Jabhat al-Nusra, an offshoot of al-Qaeda, in July. The second handed much of its equipment over to the same group in September, reportedly in exchange for safe passage.
Quoting an anonymous US Department of Defense source, the New York Times reported that the US would no longer recruit Syrian rebels to go through its training programmes in Jordan, Qatar, Saudi Arabia or the United Arab Emirates.
Instead, it would establish a smaller training centre in Turkey, where "enablers" - mostly leaders of opposition groups - would be taught operational manoeuvres like how to call in airstrikes, the newspaper said.
Analysis: Jonathan Marcus, Defence Correspondent, BBC News
The failure of the programme underscores the wider problem of the inability to create large and effective moderate forces on the ground.
It will also have wider repercussions since the programme helped to coordinate support activities between the Americans, the Gulf states, Turkey, and Jordan.
The risk now is that those countries may push on with more separate initiatives backing individual client groups.
Washington was already limited in its ability to influence events on the ground. The failure of this initiative will reduce it even further.
Speaking in a joint news conference with UK Defence Secretary Michael Fallon, Mr Carter admitted that he "wasn't satisfied with the early efforts" of the training.
The US was now looking at "different" ways to "enable capable, motivated forces on the ground to retake territory from ISIL and reclaim Syrian territory from extremism", he added, using another acronym for IS.
Russian missile 'malfunction'
Mr Carter also said there were indications that four Russian cruise missiles that crashed in Iran before reaching their targets in Syria had malfunctioned.
Media captionWho’s fighting whom in Syria? Explained in 90 seconds
The defence secretary is the first US official to comment publicly on the reports that the Russian missiles crashed. Russia has denied the claim, saying all 26 missiles hit their targets.
The missiles were fired from the Caspian Sea some 1,500km (930 miles) away, their route taking them over Iran and Iraq. They were launched in support of a major ground offensive by Syrian government troops in western Syria.
Mr Carter accused Russia of running "fundamentally flawed" operations in Syria which would "inflame the civil war and therefore extremism".
Moscow says it has been hitting IS positions and denies reports that Russian strikes have mainly targeted other opponents of Syrian President Bashar al-Assad.
A Scottish nurse who contracted Ebola in Sierra Leone last year is in a "serious condition" after being readmitted to an isolation unit in London.
NHS Greater Glasgow and Clyde confirmed that the virus is still present in Pauline Cafferkey's body after being left over from the original infection.
She is not thought to be contagious.
The 39-year-old has been flown back to the isolation unit at the Royal Free Hospital in London.
Bodily tissues can harbour the Ebola infection months after the person appears to have fully recovered.
Ms Cafferkey, from Cambuslang in South Lanarkshire, spent almost a month in the unit at the beginning of the year after contracting the virus in December 2014.
Media captionBBC News looks at why some Ebola survivors suffer a flare up of symptoms after recovering from the virus.
We will be taking your questions on Ebola on BBC News Channel today at 15:30 BST. Email haveyoursay@bbc.co.uk with your queries.
NHS Greater Glasgow and Clyde (NHSGGC) said she had been admitted to the Queen Elizabeth University Hospital in Glasgow on Tuesday after feeling unwell and was treated in its infectious diseases unit.
She was then transferred to the Royal Free Hospital in the early hours of Friday morning due to an "unusual late complication" in her illness.
Dr Emilia Crighton, NHSGGC director of public health, said: "Pauline's condition is a complication of a previous infection with the Ebola virus.
"The risk to the public is very low. In line with normal procedures in cases such as this, we have identified a small number of close contacts of Pauline's that we will be following up as a precaution."
Government sources have described her transfer to the specialist unit as a "highly precautionary process".
Background by Stuart Nicolson, BBC Scotland News
Colleagues who worked with her have spoken of Ms Cafferkey's dedication and enthusiasm for her role at the Ebola Treatment Centre in Kerry Town.
And in extracts from her diary published by the Scotsman newspaper, she described how the work she was doing had quickly come to feel like a "normal part of life".
She wrote: "My nice community nursing job in Blantyre is far removed from this but at the moment this seems a lot more real. The dreams that I do remember always seem to have an Ebola theme, it seems to be all consuming."
During the third week of her diary, she described "an awful shift" during which she had to tell a young boy, whose father had died from Ebola, that the virus had also killed his mother and sister.
"His mother had seen her daughter die in the bed across from her that morning and she died a few hours later," she wrote.
Dr Ben Neuman, a virologist from the University of Reading, told BBC Radio's Good Morning Scotland programme that the outlook for Ms Cafferkey was good and it was unlikely the virus remained infectious.
He said: "Once the virus is removed from the blood once, it tends to retreat into the hard-to-access components of the body. It'll hide in places like the back of your eye or breast milk."
He said the effects of the virus on the body could last for up to two years, although it was difficult to know how long it could actually persist.
Image copyrightGetty Images
He added: "The nice news here is that she's beaten the virus once so she can probably beat it again.
"The odds are that she has actually inherited a lucky set of genes and these are probably what protected her the first time and probably what will keep her safe the second time regardless of any treatment. The outlook's good."
Ebola is passed on through bodily fluids. It is not transmitted through casual contact.
Analysis by James Gallagher, health editor, BBC News website
Finding the virus in Ebola survivors months after recovering is not unheard of.
Previous outbreaks have shown the virus can survive in semen and it was found in the eye of a US doctor two months after recovering.
This can pose health problems for the patient, but is there a risk of spreading the virus?
Men are advised to use condoms indefinitely until more is known.
But there are now so many survivors in West Africa - around 13,000 - that if there was a major risk then we would know about it.
Liberia did have a mini Ebola flare-up after going more than 40 days without a case.
Ebola virus persisting in survivors is one possible explanation.
Experts say there will have to be monitoring for Ebola flare-ups for years after the epidemic is over.
Last week Ms Cafferkey, who works at the Blantyre Health Centre, was in London receiving an award at the Pride of Britain ceremony which recognised the risks aid workers took with their own health.
There are not thought to be any concerns about contact she had with people at the event but health officials in Scotland are focusing on who she had seen since her return home.
Ms Cafferkey contracted Ebola while working as a volunteer with Save the Children at a treatment centre in Kerry Town, in Sierra Leone.
She was diagnosed on 29 December last year, after returning to Glasgow via London.
Image copyrightGetty ImagesImage captionMs Cafferkey contracted Ebola while working as a volunteer in Sierra Leone last year
Her temperature had been tested seven times before she flew from Heathrow to Glasgow and she was cleared to travel, before later falling ill.
She was placed in an isolation unit at Glasgow's Gartnavel Hospital after becoming feverish, before being transferred by an RAF Hercules plane to London on 30 December.
She was then transferred to the specialist isolation unit at the Royal Free.
Symptoms include high fever, bleeding and central nervous system damage
Spread by body fluids, such as blood and saliva
Fatality rate can reach 90% - but current outbreak has mortality rate of about 55%
Incubation period is two to 21 days
There is no proven vaccine or cure
Supportive care such as rehydrating patients who have diarrhoea and vomiting can help recovery
Fruit bats, a delicacy for some West Africans, are considered to be virus's natural host
At the time, Dr Michael Jacobs, from the Royal Free's infectious diseases team, said Ms Cafferkey had completely recovered and was "not infectious in any way".
NHS Lanarkshire said she had begun a phased return to work in mid-March, and had last been at work on 1 October.
Consultant in Public Health David Cromie said: "Pauline was well while at work and there is no wider public health risk for patients treated by her or her staff colleagues.
"In line with normal procedures in cases such as this, a small number of close contacts of Pauline have been identified and will be followed up as a precaution.
"Together with Pauline's colleagues, our thoughts are with Pauline and we wish her a full speedy recovery."
Deadliest outbreak
Image copyrightGetty Images
West Africa's Ebola outbreak was first identified in March 2014 - within hours doctors set up field hospitals to treat the sick.
Aid workers from countries across the world, including the UK, Germany, France, Italy, the US and Spain, volunteered to help.
More than 11,000 people have died from the virus since the epidemic erupted.
Ms Cafferkey had visited Mossneuk Primary School in East Kilbride the day before she fell ill, where she gave a presentation at an assembly to thank the school for raising money.
Health experts have offered reassurance to parents, stressing that Ebola cannot be spread through ordinary social contact.
The World Health Organisation admits not much is known about the long-term implications after having Ebola.
Some survivors of the virus have had eye and joint problems, as well as ongoing fatigue.
