Can symptoms of non hodgkin's lymphoma improve without chemo?

For a short time: Symptoms due to lymphoma are best managed by treatment. Sometimes a short course of steroids wil be of help. Pressure symptoms may be relived by radiation. Chemotherapy with immunotherapy is still the best approach in most cases.

No: Non-hodgkin lymphoma (nhl), like other cancers, requires treatment. That treatment can be varied (surgery, chemotherapy, radiation), but it is required for the cancer to be treated. It will not regress on its own.