What causes concave horizontal lines on the toenail of the big toe?

Reasons for Concave Horizontal Lines on Big Toenails

Concave horizontal lines on big toenails may be caused by trauma to the nail root, usually due to accidental bumps or wearing shoes that are too tight, which may lead to injury. Skin diseases such as paronychia and eczema in the local area can also cause horizontal lines. Additionally, a lack of essential trace elements in the body, such as zinc, can also result in horizontal lines. It is recommended to undergo a trace element examination at the hospital for targeted treatment.

Reasons for Concave Horizontal Lines on Big Toenails

1. The horizontal lines on the big toenails are called Beau's lines, which are caused by temporary obstruction of the nail plate protein during its formation. They are commonly seen in systemic diseases or influenced by local factors.

2. If only the big toenail has horizontal lines while other nails are unaffected, it is usually caused by local factors. The most common cause is trauma to the nail root, such as wearing tight shoes or accidental bumps.

3. Local skin diseases may also cause horizontal lines, such as paronychia, intestinal acrodermatitis, and eczema around the nails. Overly trimming the nails or recent X-ray examinations of the feet may also result in horizontal lines on the nails.

4. Deficiency of essential trace elements, usually zinc, can also lead to horizontal lines on the nails.

5. Hyperthyroidism or pregnancy may also cause horizontal lines on the nails, which are temporary and can gradually recover with nail growth.

Precautions for Concave Horizontal Lines on Big Toenails

1. Maintain a regular sleep schedule and avoid sleeping too late on weekends. If you sleep late on Saturday and wake up late on Sunday, you may experience insomnia on Sunday night.

2. Avoid overeating or drinking excessively before bedtime. Have a light dinner about two hours before bed and do not drink too much water, as frequent trips to the bathroom at night can disrupt sleep quality. Avoid spicy and greasy foods in the evening, as they can also affect sleep.

3. Avoid caffeine and nicotine before bedtime. It is recommended to avoid drinking coffee within eight hours before bedtime.

4. Choose the right time for exercise. Afternoon exercise is the best time to help with sleep, and regular physical exercise can improve the quality of nighttime sleep.