
Toenail problems can be caused by a variety of issues, including injuries, fungal infections, and underlying conditions. Toenail fungus, or onychomycosis, is a common issue that occurs when fungi enter the space between the toenail and the nail bed, typically through a crack or cut in the toe. This leads to the nail thickening and potentially becoming misshapen or discoloured. Other causes of toenail thickening include psoriasis and yeast infections. Repetitive injuries to the toenail, often caused by tight shoes, can result in retronychia, where new nail plates grow on top of each other under the old nail plate. Ingrown toenails are another common issue, where the edge of the toenail grows into the surrounding skin, causing pain and swelling.
| Characteristics | Values |
|---|---|
| Cause | Fungal infection, psoriasis, repetitive injury to the nail, wearing tight shoes, toenail trauma, fingernail dysplasia, ingrown toenail |
| Symptoms | Nails may change colour, looking white, yellow or brown, thicken, become fragile, separate from the nail bed, become chalky or cloudy, cause pain, become misshapen, develop pits or ridges |
| Treatment | Vicks VapoRub, tea tree oil, phenol treatments, medication, debridement, trim or file rough edges, soak toe in cold water, petroleum jelly, adhesive bandage |
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What You'll Learn

Onychomycosis, a fungal infection
Onychomycosis is a fungal infection of the nail unit, which can affect both the toenails and fingernails. It occurs when a fungus or yeast enters the toenail, growing under the nail bed in moist environments. The infection is initially minor but can spread over time, causing the toenails to thicken and become misshapen, fragile, and separated from the nail bed. Discolouration may also occur, with the toenail turning white, yellow, or brown.
Onychomycosis is caused by various organisms, most commonly dermatophytes of the genus Trichophyton. When dermatophytes are the cause, the condition is called tinea unguium. Other causes include yeasts, such as Candida, and nondermatophyte molds, which are more common in patients with human immunodeficiency virus (HIV) infection. The infection is more likely to occur in individuals with diabetes, psoriasis, athlete's foot, peripheral vascular disease, immunologic disorders, or those who smoke, wear occlusive footwear, or use shared bathing facilities.
The diagnosis of onychomycosis is confirmed through microscopic examination of a small sample or nail shards collected from underneath the nail. Treatment options include systemic antifungals, oral therapy, topical therapy, laser treatment, and photodynamic therapy. In severe cases where medication is ineffective, debridement may be necessary, which involves the surgical removal of the toenail or fingernail.
Onychomycosis affects 1–8% of the population, with a higher prevalence in older adults. While it is not life-threatening, severe complications such as cellulitis, sepsis, osteomyelitis, tissue damage, and nail loss can occur.
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Psoriasis, a skin condition
Toenail changes can be indicative of underlying medical conditions. One such condition is nail psoriasis, an autoimmune disease that affects the fingernails and toenails. It causes the skin cells to reproduce quickly, leading to nail pitting, ridging, crumbling, and discolouration. The discolouration may appear as yellow, red, pink, or brown spots, known as salmon patches or oil drop spots. While nail psoriasis is not a fungus, it can co-occur with a fungal infection called onychomycosis, which can further thicken the nails.
Nail psoriasis is characterised by an overreaction of the immune system, leading to rapid growth of new skin cells. This results in changes to the structure and appearance of the nails, such as horizontal grooves (Beau's lines) and thinning of the nails, which may cause them to crumble. In some cases, the thick layer of skin underneath the nail may separate from the nail bed (onycholysis), potentially leading to the development of nail fungus.
The risk of nail psoriasis is higher in individuals with psoriatic arthritis, with up to 4 out of 5 people experiencing nail changes. However, it is important to note that fingernails are more frequently affected than toenails. While nail psoriasis can cause discomfort and pain, it often manifests mildly in many individuals.
Treatment options for nail psoriasis include prescription and over-the-counter medications, phototherapy, laser therapy, and home remedies such as aloe vera gel. Injections of corticosteroids or other psoriasis medications can help treat nail thickening and separation. Additionally, systemic treatments, such as tablet-based or injected therapies, may be considered for severe cases that impair an individual's ability to walk or use their hands properly.
It is important to consult a healthcare provider for an accurate diagnosis and tailored treatment plan. While there is no cure for nail psoriasis, early treatment can prevent it from worsening and reduce its impact on daily activities.
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Tinea Unguium, a dermatophyte infection
Onychomycosis, also known as tinea unguium, is a fungal infection of the nail. It is caused by fungi entering the space between the toenail and the nail bed (the tissue right underneath the toenail). This usually happens through a crack or cut in the toe. Fungi thrive in moist environments, so wearing nail polish, occlusive footwear, or going barefoot in damp public places can make the infection worse.
Tinea unguium is specifically caused by a dermatophyte infection. Dermatophytes are fungi that infect keratinized tissue and belong to the Trichophyton (most common), Microsporum, and Epidermophyton genera. The most common dermatophyte involved in onychomycosis is Trichophyton rubrum, but other dermatophytes may also be involved, including T. interdigitale, Epidermophyton floccosum, Tricholosporum violaceum, Microsporum gypseum, T. tonsurans, and T. soudanense.
The most common symptom of tinea unguium is the nail becoming thickened and discoloured, with white, black, yellow, or green hues. As the infection progresses, the nail can become brittle, with pieces breaking off or coming away from the toe or finger completely. The skin underneath and around the nail may become inflamed and painful, with white or yellow patches on the nail bed or scaly skin next to the nail, and a foul smell.
Tinea unguium can be diagnosed by taking a small sample from underneath the nail and viewing the cells under a microscope. Treatment options include systemic and topical antifungal therapies, with systemic therapy being more effective but requiring monitoring for potential adverse effects. In cases of refractory or severe infection, toenail removal is recommended. Preventative measures include keeping the skin clean, cool, and dry, and not sharing personal items such as towels.
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Repetitive injury, e.g. wearing tight shoes
Toenail issues can be painful and uncomfortable. Repeated trauma to toenails, caused by ill-fitting shoes, can lead to deformities and cosmetic concerns. This can include thickened nails, discolouration, and lifting away from the nail bed. Tight shoes can cause friction and irritation, leading to bleeding under the toenail. This is known as a subungual hematoma, which may require medical treatment to drain the blood and relieve pressure.
Toenail injuries can also occur due to friction from shoes that are too loose, or from stubbing your toe or dropping an object on it. Sandal and soft-shoe wearers may be more prone to injury, as their toes are exposed and not protected. Runners often experience toenail trauma due to the repetitive motion of the nail rubbing against the shoe.
Ingrown toenails are another common issue, where the corner or edge of the toenail grows into the surrounding skin. This can be very painful and, if left untreated, can lead to serious infections. The big toe is most susceptible to this issue as it is in frequent contact with footwear.
If you are experiencing toenail pain, it is recommended to consult a podiatrist for professional advice and treatment. They can help diagnose and treat any underlying issues, such as fungal infections or trauma caused by repetitive injury from tight shoes.
It is important to prioritise the health of your feet when choosing footwear. Ensuring your shoes fit properly and do not cause friction or irritation to your toenails is crucial to prevent injuries and maintain healthy toenails.
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Yeast onychomycosis, often caused by Candida
Onychomycosis is a fungal infection that affects the toenails and fingernails, causing discolouration, thickening, and separation from the nail bed. It occurs when a fungus or yeast enters the toenail, growing under the nail bed where it is moist. While onychomycosis is more common in toenails, yeast onychomycosis caused by Candida is more likely to affect the fingernails. Candida is a type of yeast that normally exists on and in the body, but certain factors can cause it to multiply out of control, leading to an infection known as candidiasis.
Candida thrives in warm, humid environments, and it can cause infections in the nails, skin, and mucous membranes throughout the body. The infection can result in discolouration and weakening of the nails, causing them to become thicker and more discoloured over time. While the condition is not usually painful, it can lead to discomfort when wearing shoes if left untreated.
Yeast onychomycosis is typically caused by Candida albicans, the most common species of Candida. This yeast is present on the skin and mucous membranes that line the inside of many structures in the body. While Candida is usually harmless, changes in the body can create the right environment for it to cause an infection. Factors such as diabetes, hormonal conditions, and a weakened immune system can increase the risk of developing a Candida infection.
Treatment for yeast onychomycosis often involves addressing any underlying medical causes and managing the infection to prevent its spread. While some cases may require medication, more severe or persistent infections might need surgical removal of the affected nail. It is important to note that mycotic nails can recur even after successful treatment, and preventative measures should be taken to reduce the risk of reinfection.
To summarise, yeast onychomycosis caused by Candida is a fungal infection that affects the nails, leading to discolouration, thickening, and other symptoms. While it typically affects the fingernails, it can also occur in the toenails, and proper treatment and prevention are crucial to manage the condition effectively.
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Frequently asked questions
There are several reasons why this could be happening. Firstly, toenail fungus, or onychomycosis, is a common condition that occurs when fungi get between your toenail and toenail bed. This usually happens due to a small crack or cut in your toe. Secondly, nail psoriasis can cause an overgrowth of keratin under the nail, known as subungual hyperkeratosis, resulting in a white, chalky substance. Lastly, retronychia is a condition where new nail plates grow on top of each other in layers under the old nail plate due to repetitive injury to the nail, often from wearing tight shoes.
Some common signs and symptoms of a fungal infection include colour changes to the nail, such as white, yellow, or brown discolouration, thickening of the nail, and separation of the nail from the nail bed. It may also be painful, especially if shoes are pushing down on the nail.
If you suspect you have a fungal infection, it's best to consult a healthcare professional. They may take a small sample from underneath your nail to analyse it and confirm the diagnosis. Treatment for toenail fungus typically involves sticking to a plan for several months, which may include daily applications of products like Vicks VapoRub or tea tree oil.











































