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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

A breech birth. This image illustrates a newborn that has been delivered buttocks first. A breech birth. This image illustrates a newborn that has been delivered buttocks first.
electron microscope image of a diatom electron microscope image of a diatom
Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra
Lilly Martin Spencer’s Young Husband: First Marketing (1854). Note that passers-by are amused at thi Lilly Martin Spencer’s Young Husband: First Marketing (1854). Note that passers-by are amused at thi
The photo shows an ultrasound image of a fetus of about 20 weeks’ gestational age. The photo shows an ultrasound image of a fetus of about 20 weeks’ gestational age.
Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ... Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ...
Video: Conduction of action potentials

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