Shape and texture of nails

Nails curving around the fingertips can be a sign of lung disease, heart disease, and inflammatory bowel disease.

Discolored nails

Yellowish-pink or brownish-red spots that extend from the cuticle to the tip of the nail indicate psoriasis. Yellow nails can also indicate jaundice.

Inconsistent nail growth

Slow nail growth may be a sign of anemia, while rapid growth can indicate hyperactive thyroid, in which the thyroid gland produces too much hormone.

Nails scooping outward

Lifting nails or onycholysis is a disorder where the fingernails part from their nail beds. This typically denotes a thyroid condition or psoriasis in cases of trauma.

Beau's lines

These are ridges that run across the nails and it can be a sign of serious underlying conditions. It can indicate uncontrollable diabetes or zinc deficiency in your diet.