Thumb Hypoplasia (for Parents) - Nemours KidsHealth - Weak thumbs
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There are several possible causes of a weak thumb. Symptoms can be indicative of deeper problems such as carpal tunnel syndrome, or a result of an injury to the wrist, or thumb itself, such as muscle sprains or bone fractures. Other reasons for weak thumb problems may be. Numbness in the thumbs can have a broad range of causes. Other symptoms include tingling, weakness, and a tendency to drop objects.