Everyone Healthy Library
Brown Nails
Sign or symptom reference page from the Everyone Healthy database.
! Seek urgent medical care if warning signs appear
A symptom can have many possible causes. Some symptoms need urgent assessment, especially when they are severe, sudden or rapidly worsening.
Get urgent medical care now if there is any severe, sudden, rapidly worsening or worrying symptom, especially:
- chest pain, pressure or pain spreading to the arm, jaw or back
- trouble breathing, blue lips, severe wheeze or choking
- stroke-like symptoms such as face drooping, arm weakness or speech trouble
- collapse, fainting, seizure, confusion or extreme drowsiness
- severe bleeding, black stools, vomiting blood or major injury
- severe allergic reaction, swelling of the face/throat or widespread rash with breathing trouble
- severe abdominal pain, severe headache, stiff neck or sudden vision change
- signs of severe dehydration, sepsis, high fever with worsening illness, or symptoms in a baby/young child that concern you
Full information
Brown Nails
Fingernails are brown in colour. Brown nails can sometimes be caused by thyroid disease, pregnancy, malnutrition, frequent use of nail varnish or cigarette smoking.