Medical

Human herpesvirus 8, a herpesvirus that contributes to the development of Kaposi sarcoma, an otherwise rare form of cancer sometimes seen in AIDS patients, and to some B-cell lymphomas.

A rare, cancer-like disorder in which both histiocytes and lymphocytes start to proliferate and attack body tissues or organs.

A tuberculosis infection of the spine that is seen most often in children. The main symptom is back pain. Untreated tuberculous diskitis can lead to inward or outward curvature of the spine.

Straining to defecate or urinate. Tenesmus refers especially to ineffectual and painful straining for an extended time.

Blood in the urine that can be seen with the naked eye. Hematuria may or may not be accompanied by pain, but it is always abnormal and should be further investigated.

A group of headaches felt to involve abnormal sensitivity of the blood vessels (arteries) in the brain to various triggers, resulting in rapid changes in the artery size due to spasm (constriction).

A sudden and excruciatingly painful headache.

A headache caused by contracting of the muscles in the back of the neck, on the scalp, and sometimes in the jaw. Tension headaches are usually related to stress.

A headache caused by pressure within the sinus cavities of the head, usually in connection with sinus infection.

A headache experienced by someone who has taken pain relievers for migraines or other health conditions and has built up a tolerance for these medications.