Your feet, often overlooked, can be the first indicators of deeper health problems. Medical experts emphasize that symptoms affecting the feet can reflect serious conditions such as diabetes, heart disease, thyroid disorders, or poor circulation. In this article, we’ll look at scientifically-backed signs that can appear on your feet, and what they could mean for your overall health.

Changes in nail color and shape

Spoon-shaped nails

Spoon-shaped nails (koilonychia) curve upwards and can hold a drop of fluid. This abnormality is often associated with iron deficiency anemia. Low iron levels disrupt the growth and structure of nails. If it is observed together with fatigue and pallor, it is time to see a doctor. In rare cases, it is also a sign of heart disease or hemochromatosis (excessive iron accumulation).

Yellowed or thickened nails

Thick, yellow nails usually indicate a fungal infection, but they can also signal psoriasis or thyroid disorders. People with weakened immune systems (HIV, diabetes) are especially vulnerable. Persistent changes are treated with antifungal or systemic agents. In yellow nail syndrome, this condition is also associated with lymphedema or respiratory problems.

Dark streaks under the nail

A dark line under the nail without trauma could be subungual melanoma, a rare but serious form of skin cancer. Any dark or changing line should be evaluated immediately. A dermatologist will perform a biopsy if malignancy is suspected.

Skin and coloring changes

Constantly cold feet

Chronically cold feet may indicate peripheral arterial disease (PAD), hypothyroidism, or circulation problems. PAD narrows the arteries, reducing blood flow to the extremities. People over 50, smokers, and diabetics are at highest risk.