11303 Toenail Fungus

Overview

Toenail fungus is a common infection where tiny fungi get under the toenail and grow. It can make the nail look yellow, white, thick, or crumbly. It usually starts at the edge of the nail and slowly spreads toward the base.

Very common. Fungal nail infections affect around 1 in 10 adults at some point, and the risk rises with age.

It can affect anyone, but it is more common in older adults, people with diabetes, athletes, and people whose feet are often damp or sweaty.

Symptoms

Common symptoms

• Thickened, discolored nail — often yellow, white, brown, or green
• Brittle, crumbly, or ragged edges
• Distorted nail shape
• Build-up of debris under the nail
• A foul smell from the toe
• Pain or discomfort when wearing shoes

Symptoms in children

• A white or yellow patch on the nail
• Nail thickening or roughness
• The nail may start to separate from the nail bed

Symptoms in older adults

• Long-standing thickening and yellowing of one or more toenails
• Hard, brittle nails that are harder to trim
• Nail pain when walking or wearing tight shoes

Causes

Main causes

• Fungal organisms called dermatophytes invade the nail through small cuts or the gap between the nail and nail bed.
• Fungi thrive in warm, damp places like sweaty shoes, locker-room floors, and communal showers.
• Walking barefoot in public areas where the fungus lives can allow the infection to start.

Risk factors

• Age — risk increases as nails become more brittle and blood circulation slows
• Diabetes or a weakened immune system
• Repeated nail trauma or injury to the toe
• Heavy sweating or wearing tight, non-breathable shoes
• Living with someone who has a fungal infection
• Using public swimming pools, gyms, or showers

When to see a doctor

See a doctor urgently if:

• Signs of a bacterial infection: increasing redness, swelling, pain, or pus
• Diabetes and you notice any break, cut, or discoloration around your toe
• Red streaks or fever

Book a routine appointment if:

• Your nail looks thickened, yellow, or misshapen and has not improved with self-care
• You are not sure if it is fungus or something else
• The infection is spreading to other toes or to your skin

Diagnosis

A healthcare provider can usually tell if you have toenail fungus by looking at your nail. They may ask about your foot-care routine and any health conditions like diabetes. If the diagnosis is not clear, they can take a sample.

Tests that may be done

• Nail clipping: a small piece of your nail is sent to a lab to look for fungus.
• Microscopy and culture: the sample is examined under a microscope or grown in the lab to identify the fungus.
• Sometimes a small amount of skin is scraped from under the nail if the area is painful or swollen.

What to expect at your appointment

The examination is quick and painless. Taking a nail sample may feel a little odd, but it does not require an injection or any special preparation. You usually get the result within a week or two, and your doctor will then talk through treatment options.

Treatment

Treatment for toenail fungus is usually successful, but it takes time. Options range from special medicated nail polish to prescription antifungal tablets. Your doctor will recommend the best approach based on your age, overall health, and how widespread the infection is.

Self-care at home

• Keep your feet clean and dry, especially between the toes
• Trim nails straight across and smooth rough edges with a file
• Wear clean, breathable socks every day — change them if they get damp
• Choose shoes that are not too tight and let air reach your feet
• Disinfect nail clippers before and after each use
• Do not share towels, socks, or nail tools with others

Medical treatments

Medical treatment may include a medicated nail polish or cream applied to the nail, or a course of oral antifungal medicine. These treatments are usually used for several weeks or months. Some treatments are available from a pharmacy without a prescription, but it is worth asking a pharmacist or doctor which type is appropriate for you.

When is surgery considered?

Treatment usually starts with medicine. A minor procedure to remove a thickened, painful nail may be an option if medical treatment has not worked, or if the nail is pressing into the skin and causing repeated problems.

Living with this condition

Living with toenail fungus mostly involves patience and careful nail care. You can still walk, run, and exercise, but you may need comfortable shoes. Over weeks and months, a clearer nail will slowly grow in from the base.

Lifestyle tips

• Air your feet out at home whenever possible
• Use antifungal foot powder or spray if your feet get sweaty — ask your pharmacist
• Choose moisture-wicking socks and alternate your shoes so they dry out
• Wear flip-flops in communal showers and around public pools
• Keep your nails short and clean to reduce pressure and pain

Diet and exercise

There is no special diet that cures fungus, but eating well helps your immune system fight infection. Regular exercise is fine — just dry your feet well and change socks afterward.

Mental health and emotional wellbeing

A visible nail infection can make some people feel embarrassed or self-conscious, especially in summer or at the pool. It can help to talk to a trusted friend, pharmacist, or healthcare provider. Remember that this is a common infection and nothing to be ashamed of.

Prevention

It can often be prevented with simple habits: keep your feet clean and dry, protect your feet in shared wet areas, wear breathable shoes, and avoid sharing nail clippers or towels.

Vaccines

There is no vaccine for toenail fungus.

Screening programmes

There is no routine screening for nail fungus. If you have diabetes, your annual foot check will include looking at your nails. Keep an eye on any changes and mention them to your healthcare team.

Complications

If left untreated

• The nail may become thicker, more painful, or harder to trim
• The fungus can spread to other toenails, fingernails, or to the skin between toes (athlete's foot)
• The nail may become permanently damaged or discolored
• People with diabetes or poor circulation may have a higher risk of skin infection and foot ulcers

Long-term outlook

With treatment, most fungal nail infections improve over time. Because nails grow slowly, it can take six months to a year for a completely clear nail — and it can be longer for toenails. Even if it returns, it is still manageable. Talk to your healthcare provider about what to expect and how to reduce the chance of it coming back.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.