Calf is achey. History of sciatica. The arch of foot seems to be collapsing with weigh. A little tender to touch. No swelling, heat, or redness. Cause?

Its All Related. Back is related to how the arch fell in your foot resulting in knee joints changing position that results in hip issues then translating to stress in your spine resulting in pieced nerves causing your sciatica. Thats said, likely improving your arch with support/orthotic will help reduce the back pain. Remember this will not happen overnight but will take time and your feet will hurt initially.
Calf pain. Consider posterior tibial is tendon dysfunction with your fallen arch. May be residua of pinched nerve. Consider DVT also as a more ominous condition.

Related Questions

Sciatica or clot? Crampy calf occasional pain in arch and down from hip. No redness swelling tenderness to touch. Walking doesn't worsen after longtrip

Likely scaitica . If there were only two choices, sciatica would be it. This could certainly be sciatica or radicular pain. Read more...
Tests needed. Sciatica is diagnosed on clinical grounds based on your pain complaints(typically low back pain and shooting, burning pain into one or both legs). This is usually confirmed with an MRI of your spine, which may show disc herniation or spinal stenosis. If the venous doppler on your leg was negative, the chances of a deep venous thrombosis are less likely. Read more...
Generally you can't. Unless you have a fever or swollen limb which may suggest a clot more than sciatica otherwise not very specific. I would suggest ruling out the clot first and then workup the sciatica issue afterwards. Read more...