Abscess in kidney.

Medical illustration of cystitis- inflammation of the bladder. Common symptoms include: frequent urination with ur- gency and burning; blood my be seen in urine; bladder spasm may occur. Cystitis occurs more commonly in women.

Medical illustration of prostatitis, inflammation of the prostate. Common symptoms include frequent urination with urgency & burning; pain around anus may be severe; fever & malaise may occur.

Medical illustration of epididymitis- inflammation of the epididymis. Common symptoms include: tenderness or swelling of epididymis and testicle; scrotum may be red or swollen; fever and malaise may occur.

Heart scarred by angina pectoris. Characterized by choking or pain, it often accompanies fatty deposit build-ups in the coronary arteries and usually brought on by stress or heavy eating. It indicates increasing blockage of blood flow to the heart.

Pulmonary embolism as seen from the left lung.

Illustration of mucous secretions with allergens and mast cells. Mast cells release histamine in response to allergens.

Immune system superimposed over nude male body.

Conceptual view of blood flowing through a blood vessel.

Computer model of antibodies.

Medical illustration showing heart superimposed on a man's chest.

Photo composite showing fetus developing in man's brain.

Illustration of a brain, showing a hemorrhagic stroke (left) and an ischemic stroke (right). An hemorrhagic stroke is due to bleeding caused by the bursting of a blood vessel. An ischemic stroke is due to the lack of blood to a region of the brain caused by a blood clot (thrombus).

Model of the human brain showing the right and left hemispheres.

Red brain with black background- binary numbers floating.

Red brain with blue background- binary numbers floating.

EKG superimposed on heart depicting a heart attack.

Medical illustration showing EKG superimposed on male body.

Photo illustration showing mast cell releasing histamins (purple) in response to an allergic reaction and an anti-histamine molecule (blue) blocking them to avoid inflammation and irritation.

Illustration of red blood cells.