Toenail Fungal Infection (Onychomycosis)
- Cristina Varon
- Jan 19
- 3 min read
Toenail fungal infection, medically known as onychomycosis, is a common but often misunderstood condition. It affects millions of people worldwide, causing discoloration, thickening, and brittleness of the nails.
While it may seem like a minor cosmetic issue, untreated fungal infections can lead to discomfort, pain, and even more serious foot problems. At Cristina Varon Podiatry, I focus on educating patients about the causes, symptoms, and treatment options for onychomycosis, helping them take control of their foot health.
What is Toenail Fungal Infection (Onychomycosis)?
Onychomycosis is a fungal infection that primarily affects the toenails, although fingernails can also be involved. It is usually caused by a group of fungi called dermatophytes, but yeast and non-dermatophyte moulds can also be responsible.
People of all ages can develop toenail fungal infections, but the risk increases with age, diabetes, poor circulation, or a weakened immune system. Wearing tight shoes, walking barefoot in public areas, and having a history of athlete’s foot also make someone more susceptible.
The infection often starts at the tip of the nail and gradually spreads deeper, leading to changes such as:
Yellow, white, or brown discoloration
Thickened or brittle nails
Crumbling edges or distorted nail shape
Mild pain or discomfort while walking

Causes and Risk Factors
Understanding what causes toenail fungal infections is key to prevention and treatment. Common risk factors include:
Warm and Moist Environments: Fungi thrive in damp areas like locker rooms, swimming pools, and sweaty shoes.
Nail Trauma: Injuries or repetitive pressure on the nails can allow fungi to enter.
Age: Older adults are more susceptible due to slower nail growth and decreased blood circulation.
Underlying Health Conditions: Diabetes, psoriasis, and immune system disorders increase vulnerability.
Poor Foot Hygiene: Infrequent washing or improper drying of feet encourages fungal growth.
At Cristina Varon Podiatry, I always assess both the infection itself and the factors that might contribute to it, to prevent it from returning.
Symptoms to Watch For
Toenail fungal infections often progress slowly, so early detection is important. Common symptoms I see include:
Discoloured nails (yellow, brown, or white)
Thickened nails that may lift off the nail bed
Brittle, crumbly, or jagged nails
Foul odour in more severe cases
Pain or discomfort when wearing shoes or walking
If you notice any of these signs, I recommend scheduling an appointment to determine the best course of action.
Treatment Options
Treating onychomycosis can be challenging because fungi are resilient and often hidden beneath the nail. Several treatment options are available, and I tailor recommendations to each patient’s needs:
1. Topical Antifungal Treatments
Medicated nail lacquers or creams are applied directly to the nail. These are most effective for mild infections but require consistent use over several months.
2. Oral Antifungal Medications
For moderate to severe infections, oral medications can penetrate the nail and target the fungus from within. I carefully evaluate each patient to ensure these medications are safe and effective.
4. Nail Debridement
Trimming, thinning, or removing infected portions of the nail can help treatments work more effectively and improve comfort.
I guide patients through each option and help them choose the treatment plan that best fits their lifestyle and goals.
Prevention Tips
Preventing toenail fungal infections is just as important as treating them. I advise patients to follow these steps:
Keep feet clean and dry, especially between the toes
Wear breathable shoes and moisture-wicking socks
Avoid walking barefoot in public showers or pool areas
Disinfect nail tools and avoid sharing them
Inspect nails regularly for early signs of infection
By following these habits, you can significantly reduce the chance of developing onychomycosis.
When to See a Podiatrist
Even though toenail fungal infections may seem minor, leaving them untreated can lead to more severe problems, including pain, nail loss, and secondary bacterial infections. If you notice persistent discoloration, thickening, or pain, I encourage you to schedule a visit at Cristina Varon Podiatry. I provide thorough evaluations and personalized treatment plans to restore nail health and prevent the infection from coming back. Book your appointment now or call me to discuss your concerns 07512892008






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