Why are my nails turning black?

November 23, 2025 · caitlin

Why are my nails turning black? This can be a concerning issue, often resulting from trauma, fungal infections, or medical conditions. Understanding the cause is essential for effective treatment.

What Causes Nails to Turn Black?

Nails turning black can be attributed to several factors. Identifying the underlying cause is crucial for determining the appropriate treatment or intervention.

1. Trauma or Injury

One of the most common reasons for black nails is trauma. When you injure your nail, blood can pool underneath, creating a dark discoloration known as a subungual hematoma.

  • Common causes: Stubbing your toe, dropping a heavy object, or repetitive strain from activities like running.
  • Symptoms: Pain, swelling, and a black or purple spot under the nail.

2. Fungal Infections

Fungal infections can also lead to nail discoloration. These infections, known as onychomycosis, can cause nails to appear black, yellow, or green.

  • Risk factors: Warm, moist environments, such as swimming pools or communal showers.
  • Symptoms: Thickened nails, brittleness, and a foul odor.

3. Medical Conditions

Certain medical conditions can cause nails to turn black. These include:

  • Melanoma: A serious form of skin cancer that can develop under the nail.
  • Diabetes: Poor circulation and increased risk of infections can lead to nail changes.
  • Kidney disease: Can cause discoloration due to toxin buildup.

4. Medications and Chemicals

Some medications, such as chemotherapy drugs, can cause nail discoloration. Exposure to certain chemicals can also lead to black nails.

  • Examples: Antimalarial drugs, silver nitrate, or other heavy metals.

How to Treat Black Nails?

Treatment depends on the underlying cause. Here are some general guidelines:

1. Addressing Trauma

  • Rest and Ice: Elevate the affected area and apply ice to reduce swelling.
  • Medical Attention: If pain is severe or the hematoma covers more than 25% of the nail, seek medical help.

2. Treating Fungal Infections

  • Antifungal Medications: Over-the-counter creams or prescription medications may be required.
  • Hygiene: Keep nails clean and dry, and avoid walking barefoot in communal areas.

3. Managing Medical Conditions

  • Consult a Doctor: If you suspect a medical condition, such as melanoma or diabetes, consult a healthcare professional for diagnosis and treatment.

4. Avoiding Chemical Exposure

  • Protective Gear: Use gloves when handling chemicals.
  • Medication Review: Discuss any concerns with your doctor if you suspect medication is causing nail discoloration.

When to See a Doctor?

If your nails turn black and you experience severe pain, swelling, or suspect a serious underlying condition, consult a healthcare provider. Early diagnosis can prevent complications and ensure effective treatment.

People Also Ask

Why are my toenails turning black without injury?

Toenails can turn black without injury due to fungal infections, medical conditions like melanoma, or side effects from medications. It’s important to identify the cause for proper treatment.

Can nail polish cause nails to turn black?

Yes, dark nail polish can sometimes stain nails, giving them a blackish appearance. Always use a base coat to prevent staining and allow nails to breathe between applications.

How long does it take for a black nail to heal?

The healing time for a black nail varies. A subungual hematoma from trauma may resolve in a few weeks, while fungal infections can take several months to clear with treatment.

Is a black nail a sign of cancer?

A black nail can be a sign of melanoma, a type of skin cancer. If you notice a new dark streak or changes in the nail, seek medical advice promptly.

How can I prevent my nails from turning black?

To prevent nails from turning black, protect them from injury, maintain good hygiene to avoid fungal infections, and consult your doctor about any medications that may cause discoloration.

Summary

Black nails can be alarming, but understanding the causes—ranging from trauma and fungal infections to medical conditions—helps in seeking the right treatment. If you’re concerned about your nail health, especially if the discoloration is accompanied by pain or changes in the nail, it’s best to consult a healthcare professional.

For more information on nail health, consider exploring topics such as nail care tips and common nail disorders for further insights.

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