Chronic fatigue syndrome ( CFS ) is a complex disorder that affects more than one million Americans. A couple of years ago, a study was released that claimed that XMRV (a gammaretrovirus ) was a contributing factor in developing CFS . But now, scientists say that is not the case.

While ADHD has been known to cause academic challenges for children and adolescents, tic disorders that sometimes accompany ADHD can affect a youth's social confidence as well.

Stem cell transplant patients may not only be at risk during treatment. A new study suggests that a decade later they are still more susceptible to psychological conditions and chronic illness.

Many Americans battle chronic abdominal pain, which may be a symptom of serious conditions such as irritable bowel syndrome, colitis, or gallstones. However, experts are worried that doctors are over-prescribing opioid painkillers for the pain, especially if another medication is a better option.

The exact causes of autism are still not known, and much of how the disorder develops remain a mystery. Many studies point to prenatal development links.

Symptoms of different types of dementia are similar, which can make it tough to give patients an accurate diagnosis. A marker that detects brain plaques can help doctors tell them apart.

Maintaining a weight that is overly thin can contribute to health problems in much the same way that being obese can. More recently a low body mass index has also been linked to early stages of Alzheimer's disease.

Alzheimer's disease patients can have trouble remembering basics from the faces of loved ones to where they put something down. A medical food that has showed promise in trials could help with a memory boost.

Patients suffering from hypertension may be at an added benefit. Their blood pressure medication may help lower their risk of developing Alzheimer's disease.

It's not uncommon for patients suffering from Alzheimer's disease to become confused and wander off. New shoes with built-in GPS systems may help ensure that seniors with dementia can be tracked and safely brought home.