Thanks for query
You didn't mentioned your age and sex.Differential diagnosis varies with age and sex.
Before concluding it to be stress
related or psychological,it should be properly investigated.
Proper history should be taken like onset,fever,trauma,morning pain or not, any other systemic features etc.
Investigations like routine hemogram,X-rays, RA fator,uric acid ,should be taken.
In middle and old aged persons these features may be due to spondylotic changes in spine and osteoarthritis
changes. These age related changes and treated by physiotherapy
and surgery.Rheumatoid arthritis
is treated by medicines, and physiotherapy. Surgery of deformed part is last resort.
Childhood causes are also treated by medicines and physiotherapy.
Psychological causes are treated by counselling