Most people neglect their feet, but “your feet can reveal early signs of what’s happening inside your body.” Swelling, color changes, or tightness may indicate more than fatigue—they can signal underlying health issues.

Swollen feet, or edema, happen when “excess fluid collects in the tissues of the lower limbs.” Mild swelling after standing, warm weather, or tight shoes is common. But sudden, painful, or persistent swelling—especially in only one foot—can indicate a serious problem.

Swelling can result from poor circulation, heart strain, kidney or liver issues, medication side effects, pregnancy, or injury. For example, when related to heart problems, signs include “shortness of breath, fatigue, swelling on both feet, [and] tightness in shoes or socks leaving deep marks.” Injury or infection often affects one foot and may bring redness, warmth, or pus.

Medical attention is needed if swelling “appears suddenly,” is accompanied by “chest pain or shortness of breath,” affects only one foot, or comes with fever or open sores. A doctor can evaluate the cause, check organ function, review medications, and recommend treatment.

Mild swelling can improve with simple steps: “Elevate your feet above heart level,” move regularly, wear supportive shoes, reduce salt, and stay hydrated. But remember, “swelling is a symptom, not a diagnosis,” and persistent or severe swelling should never be ignored.