Nails
Onychology, observation of the nails, is a valuable means of carrying out a health check.
Soft nails often reflect hypocalcemia and can indicate pituitary and parathyroid hypofunction.
Hard nails are a sign of general dryness of the mucous membranes and denote a diet rich in proteins and fats. When hard nails grow quickly, it is a sign of hyperthyroidism.
Vertical streaks are a sign of disturbances in the digestive, hepatic and renal systems.
White spots are the characteristic of excess sugar and can indicate a lack of calcium.
Brown spots are related to digestive problems, intestinal transit disorders.
Black spots are a sign of intoxication.
The deformation of toenails curved into spoons would be a sign of serious iron deficiency.
The absence of lunules is a sign of reduced vitality, exhaustion, slow metabolism.
Nails have nutritional needs similar to those of hair (see Health of the hair).
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