Similarly if you were prone for arthritis such as osteoarthritis, the period of inactivity could have aggravated the arthritis and hence swollen
joints. There are various causes of multiple joint pains like
osteoarthritis, gout, rheumatoid arthritis, rheumatic pathology, thyroid problems etc.
Please consult an orthopedic specialist regarding this. There are no swollen joints associated with inactivity alone as the cause. However inactivity aggravates an existing joint condition like arthritis.