A pinch of the inside of the leg belly hurts with acute strains, muscle strain, lower extremity deep vein thrombosis. 1. Acute strains: strenuous exercise of calf muscles can lead to strains, such as strenuous sports can lead to gastrocnemius muscle tears or tendon tears, can appear acute pain and swelling of the calf. 2. Muscle strain: prolonged standing, walking, running, jumping, etc. can lead to chronic strain injury of the gastrocnemius muscle of the calf. 3. Lower extremity deep vein thrombosis: when thrombosis occurs, the lower extremity can be swollen, and localized pressure and pain can also occur at the same time. The pain on the inside of the leg and stomach when pinched may be caused by other reasons, it is recommended to go to the hospital in time, after a clear diagnosis to give treatment.