Hello & Welcome to Just Answer,
In order to help you better, may I request you to fill me with the following information:
Since when are you having this problem?
Has this affected you earlier also?
Any wasting (thinning) or weakness of muscles of the hand/ thumb, thigh/ soles?
Are you under some stress/ anxiety?
Are you taking any medicines/ coffee/ beverages?
Any other medical problem or significant history?
What would be your age now?
Thanks. Shall be waiting for your reply.
Thanks for the information. Since you do not have any muscle weakness or wasting, and this problem involves primarily your thumb, it s very unlikely to be ALS in the backdrop of stress.
It is more likely to be stress related, but since you also have similar problem in your leg, it would be prudent to get your examined by your doctor.
Please have a look at the following links for further information and insight:
Best wishes. Please feel free to enquire if you require more information.