Brittle nails are a common condition where the nails become weak, dry, and prone to breaking or splitting. This can be caused by various factors, including frequent exposure to water, harsh chemicals, or a lack of essential nutrients like biotin and zinc. Environmental factors, such as low humidity or cold weather, can also contribute to nail brittleness. In some cases, brittle nails may indicate underlying health issues, such as hypothyroidism or iron deficiency. Maintaining proper nail care, including moisturizing and avoiding excessive exposure to irritants, can help improve nail strength. If the condition persists, consulting a healthcare professional is advisable.