get an reasonable excuse (note) and call the employer to notify them
Answer: It's because he/she is constantly subjecting their legs to gravity, which veins are fighting against to move blood back to the heart.
1. Analgesic like NSAIDS will help with the pain
2. Hot compress can help
3. Exercises can help
A smile! It's great to see different smiles from everywhere in the world and it's joyous all around to see positivity, and everyone having the same basis of expression no matter where they're from. :) Hope this helps!