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Women are particularly prone to develop two types of tendon problems in their hands. de Quervain's tenosynovitis is inflammation of the tendons that move the thumb, and stenosing tenosynovitis, or trigger finger, is when a digit becomes locked. These painful conditions can develop due to overuse, repetitive movements, or rheumatoid arthritis.
You wrote about weak, brittle fingernails with longitudinal ridges. I have strong nails with horizontal ridges. What causes this, and what can I do about it?