What are effective treatments for degenerative disc diseases in 2nd, 4th, 5th vertebrae?

Multiple . If no pain, don't worry about it otherwise: exercise, keep your weight down and do not smoke if you have that habit. Sometimes use of medication can be indicated ranging from over the counter to prescription ones. Getting a good night's sleep in a decent mattress can help. Some people like simple elastic back supports and inversion tables too.
Degenerative disc. Anti inflammatory medications with or without muscle relaxants, steroids, both orally and by injection, physical therapy, massage therapy, chiropractic manipulation, narcotic analgesics and surgical intervention. The later two for intractable pain and weakness.