



Worried that a groove on the back of my left hand is getting deeper. Could this be muscle wasting?
I’m 26 years old, and I’ve been experiencing muscle fasciculations since late March, especially in my left arm.
For some time now, I’ve also felt that my left arm and hand are weaker or fatigue more easily. For example, when I work out, I notice that my left forearm gets tired sooner and my grip starts to give out earlier than on my right side.
What concerns me the most right now is the groove/indentation on the back of my left hand, in the area I marked in the photos.
I found some photos from around April and compared them with current photos from October, trying to keep my hand in a similar position. I feel like this groove has become deeper or more noticeable over these months, and I’m worried that it could represent muscle wasting.
For context, I’ve had two normal EMGs during this period and have been evaluated by several neurologists, who did not find signs of motor neuron disease. Despite the feeling of weakness, I’m still able to do strength training and exercise normally.
I understand that hand position, tendons, and lighting can significantly change how this area looks, so I wanted to ask:
Do you actually see a loss of muscle volume when comparing the older and newer photos? Does anyone else have a similar groove in this area of their hand?
I’m not looking for a diagnosis from Reddit. I’m mainly concerned about the change I think I’m seeing and would like to hear from people who have noticed something similar.