What causes sweaty feet with a strong sour odor?

Generally, excessive foot sweating and strong acidic odor may be caused by sympathetic nerve excitement, environmental factors, hyperhidrosis, athlete's foot (tinea pedis), or pitted keratolysis. If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. Detailed analysis is as follows:

1. Sympathetic Nerve Excitement

After emotional stress, intense exercise, or consuming spicy food, heightened sympathetic nerve activity can lead to overactive sweat glands in the feet. The sweat interacts with bacteria, producing an acidic odor. Managing stress and reducing anxiety, washing feet promptly after exercise, maintaining a light diet free of spicy or irritating foods, and keeping feet dry can help alleviate symptoms.

2. Environmental Factors

Wearing non-breathable plastic shoes or socks for prolonged periods creates a warm, moist environment that promotes sweat secretion and bacterial growth, worsening the acidic smell. Switching to cotton, moisture-wicking socks and breathable leather shoes, avoiding wearing the same pair of shoes daily, and regularly airing and sun-drying footwear can reduce odor.

3. Hyperhidrosis

Genetic or endocrine-related factors may cause abnormally developed sweat glands in the feet, leading to persistent, excessive sweating even at rest, often accompanied by noticeable odor. Under medical guidance, treatments such as aluminum chloride solution, formalin solution (urotropine), or oryzanol tablets may be used. Apply the medication before bedtime and wrap the feet as directed to reduce sweat production.

4. Athlete’s Foot (Tinea Pedis)

Fungal infections caused by pathogens like Trichophyton rubrum break down keratin and sweat, producing acidic substances, often accompanied by itching and skin flaking. Under a doctor's supervision, topical or oral antifungals such as terbinafine hydrochloride cream, miconazole nitrate powder, or itraconazole capsules may be used. After washing feet, thoroughly dry between the toes, and avoid sharing foot basins with others.

5. Pitted Keratolysis

Bacterial infection leads to shedding of the stratum corneum on the soles, forming shallow depressions, often associated with excessive sweating and foul odor. As directed by a physician, topical or systemic antibiotics such as fusidic acid cream, erythromycin ointment, or cephalexin capsules may be prescribed. Keep feet dry and avoid prolonged soaking in water.

In daily life, wash feet daily with warm water and thoroughly dry them afterward; choose breathable footwear and change socks frequently, disinfecting shoes regularly; maintain a balanced diet and reduce intake of high-sugar, high-fat foods; avoid walking barefoot in public areas to lower the risk of infection.