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Everyone feels pain differently. A pain scale is one way for you to measure your pain so that doctors can help plan how best to

Paget's disease is a problem of abnormal bone growth. The bone tissue breaks down too fast, so the body speeds up the rebuilding

Paronychia is a skin infection (fungal or bacterial) around a nail. Symptoms of redness or swelling can come on suddenly and last

Pernicious anemia is a blood disease caused by the lack of a substance (intrinsic factor) that the body needs in order to absorb

Peak expiratory flow (PEF) is a measure of how much air a person can exhale while breathing out as hard and fast as possible. PEF

Phimosis is a condition where the end of the foreskin is so tight that the foreskin can't be pulled back to expose the head of the

Pheochromocytoma is a tumor usually found in the adrenal glands (located on the kidneys). The tumor usually is not cancerous, but

Phenylketonuria (PKU) is an inherited disorder in which the body cannot break down an amino acid called phenylalanine, which is a

Phenylalanine is one of the eight essential amino acids necessary for the basic functioning of human cells that leads to normal

pH is a measure of the acidic or basic (alkaline) nature of a solution. The pH scale ranges from 0 (most acidic) to 14 (most basic