Fungal Nail Infection (Onychomycosis)

What is it?

A fungal nail infection is a common condition where fungi invade the nail bed, nail plate, or nail matrix, causing discoloration, thickening, and sometimes painful changes in the nails.

Causes

• Dermatophytes (most common fungi)

• Yeasts (like Candida)

• Non-dermatophyte molds

Fungi thrive in warm, moist environments, so sweaty shoes, public showers, or swimming pools increase risk.

Symptoms

• Discolored nails (white, yellow, brown, or greenish)

• Thickened nails

• Brittle, crumbly, or ragged nails

• Distorted nail shape

• Nails may separate from the nail bed (onycholysis)

• Mild pain or discomfort in severe cases

Types of Fungal Nail Infection

1. Distal Subungual Onychomycosis:
   Infection starts under the tip of the nail and spreads deeper. Most common type.

2. White Superficial Onychomycosis:
   White spots or patches appear on the surface of the nail.

3. Proximal Subungual Onychomycosis:
   Infection begins at the cuticle and spreads under the nail; seen more in immunocompromised individuals.

4. Candidal Onychomycosis:
   Caused by yeast, affects fingernails more often, especially in people with frequent water exposure.

Risk Factors

• Older age

• Sweaty feet

• Wearing tight shoes

• Nail trauma

• Diabetes

• Poor immune system

• Walking barefoot in damp public areas

• Previous athlete’s foot infection

Diagnosis

• Physical examination

• Nail clipping or scraping for microscopic examination and fungal culture

• Sometimes PCR testing for fungal DNA

Treatment

Medical Treatments

• Topical antifungals: Ciclopirox, Efinaconazole, Tavaborole (less effective alone, better for mild cases)

• Oral antifungals: Terbinafine, Itraconazole (more effective for moderate to severe infections but have potential side effects)

• Nail removal: In severe or resistant cases (chemical or surgical)

Treatment usually takes several months because nails grow slowly.

Home Care Tips

• Keep nails clean and dry

• Avoid sharing nail clippers or footwear

• Wear breathable shoes and moisture-wicking socks

• Use antifungal powders or sprays in shoes

• Trim nails regularly and file down thickened areas

• Avoid nail polish and artificial nails during treatment

Prevention

• Maintain good foot hygiene

• Wear sandals in public showers and pool areas

• Change socks daily

• Avoid tight, non-breathable footwear

• Treat athlete’s foot promptly

When to See a Doctor

• If nail changes worsen or spread

• If pain or inflammation develops

• If you have diabetes or immune disorders and suspect infection

• If home remedies don’t help after a few weeks