Conditions

A baby in the womb lives surrounded by amniotic fluid. The amount changes throughout pregnancy: it rises until roughly thirty-four weeks and then falls…

Polymorphic light eruption is the most common skin reaction to sunlight. The rash appears a few hours to a day after sun exposure, typically in early spring…

Polymyalgia rheumatica is an inflammatory condition that causes pain and stiffness in the muscles around the shoulders, neck and hips.

A shingles rash heals in two to four weeks, but in some people the pain in the same place stays on after the skin has healed.

Post-polio syndrome is the return or worsening of muscle weakness, fatigue and pain in someone who had polio decades ago and had long considered that chapter…

Postural tachycardia syndrome is a condition in which the pulse races on standing, bringing with it dizziness, weakness, palpitations and brain fog.

Prader-Willi syndrome is a rare condition present from birth in which the hypothalamus does not work properly — the small part of the brain responsible for…

Pre-eclampsia is a complication of pregnancy in which, from the second half of the term onwards, blood pressure rises and the mother's organs begin to suffer…

Premenstrual syndrome is the set of physical and emotional changes that turn up in the last week or two of the cycle and clear once a period starts, or within…

A pressure ulcer is damage to the skin and the tissue beneath it caused by sustained pressure.