The human immunodeficiency virus, or HIV, is a virus that is transmitted via the blood and bodily fluids. HIV attacks the CD4+ T cells, which are blood cells that help the body fight diseases and germs.

The thymus gland is a small gland in your upper chest that has importance for your health far out of proportion to its size. It starts functioning during fetal life, manufacturing millions of immune cells called T cells.

Chronic endometritis is a female medical condition in which the lining of the uterus is inflamed. Women with chronic endometritis typically have a bacterial or viral infection that affects the reproductive system, such as bacterial vaginosis.

Your gut is filled with both friendly and unfriendly bacteria. Probiotics are supplements that help to increase the balance of friendly bacteria in your gut. Adding probiotics to your diet can improve immune health, help you synthesize vitamins and alleviate diarrhea.

The longer human immunodeficiency virus, or HIV, is present, the more likely the infected person will suffer a number of health difficulties. HIV makes the body more susceptible to other conditions that may be life-threatening.

There are many symptoms of HIV that present in the mouth. Approximately 90 percent of HIV-positive patients will experience at least one oral disorder, according to TheBody.com, a compendium of knowledge on HIV and AIDS.

Since the HIV virus damages the immune system of the people who get infected with it, these patients need to be aware of any potential signs of illness. In patients with HIV and AIDS, a cough can be a sign of a variety of pulmonary infections or irritations.

During menses, or menstruation, a female sheds blood during her monthly cycle. This period can be draining for many girls and women, and they do not feel their best.

Smoking weakens the immune system by depressing antibodies and cells that are in the body to protect against foreign invaders.

Dizziness and fatigue are two symptoms frequently reported to physicians in primary care practices. In a study conducted by Drs. Kroenke and colleagues and cited in "The Archives of Internal Medicine" in 1990 only 39% of patients reported receiving treatment that brought relief from these symptoms.

The earliest symptoms of an HIV infection typically occur between two to four weeks after the initial infection. This is because it takes time for the virus to infect enough cells to begin spreading throughout the body and affect your health.

Throughout pregnancy, many women complain of fatigue. In early pregnancy, this is due primarily to hormones and the many changes your body is dealing with. In late pregnancy, the reasons are often more complicated and sometimes unique to each woman.