Knowing how common a certain condition is can help prepare health care systems to treat patients. But the estimates for one disease may be way off.

Patients with HIV are now able to live longer and healthier lives than ever before — but only when their HIV status is known and treated.

Doctors don't usually encourage patients to deviate from their vaccination schedules, but new evidence suggests that less may actually be more — at least when it comes to the HPV vaccine.

There may be some good news for HIV patients — starting medication immediately after diagnosis may help keep patients healthy longer.

Three may be a crowd when it comes to company, but it might be an ideal number when it comes to medication for treating hepatitis C.

Good news for cirrhosis patients: Survival may be much more common than it once was.

Hepatitis C patients may soon have another medication option.

Taken with a heart medication, two hepatitis C drugs might pose some serious health risks.

The cost of treating a chronic disease can add up, sometimes leading patients to hold off until the disease progresses. The most cost-effective way to treat a common liver condition, however, might be to face it head on.

Genital herpes and HIV are similar in that both are sexually transmitted viruses — and now it looks as though they might also respond to the same medication.