1. Discolored nails
Healthy nails are usually slightly pink with a hint of white-pink near the base of the nail. When the nail becomes paler or has discolored patches, this can be one of the warning signs of health problems.
Blue nails: it can signal a bacterial infection, you should see a doctor for a check-up.
Red streaks in the nail bed: the cause may be broken capillaries under the nail surface.
Blue or purple: it can be a sign of low oxygen in the blood.
Pale color: can be a sign of vitamin deficiency or anemia.
2. Unusual thickening of the nails
If the nails start to thicken, it can be a sign of some lung problems. When the nails not only thicken but also become rough, it is a sign of a fungal infection; or you are having thyroid problems, psoriasis.
3. Brittle Nails
Cracked or brittle nails can be a sign of a deficiency in folic acid, vitamin C, or protein; poor nutrition or possible anemia; psoriasis.
4. Spoon-shaped nails
Concave nails, often called spoon-shaped nails, are a warning sign of anemia, liver disease, or hemochromatosis, which occurs when the body absorbs too much iron, heart problems, or hypothyroidism.
5. Scaly nails
The multiple layers of keratin that make up the nail give it a shiny appearance on the surface. Usually, the nail surface begins to peel off because the nail has been exposed to strenuous activities. This can be the result of exposure to very hot, cold, or dry environments. It can also be a reaction to certain chemicals, soaps, or detergents.
6. White spots on nails
White spots on the nails are a common sign of zinc deficiency or anemia.
7. Ridged Nails
Healthy nails will have a smooth surface and no obvious ridges. If the ridges form wavy lines, it can indicate certain health problems such as iron deficiency, arthritis, lupus or other autoimmune diseases.