The most common causes are:
Consult Orthopaedic doctor. Ifyou got neck painwith arm/upper limb pain itmay bedue to compression of nerve root fibres. Only neck pain can betreated with physiotherapy.
Disc is more of water content. If you are not drinking enough water disc will be dehydrated, therefore the height and elasticity of disc will bereduced,resulting indisc prolapse with minimal strain. lfyou do not haveheart or renal problemtake 3 litres ofwater every day.
You might need painkillers and muscle relaxant. Main treatment is physio (might need IFT). You need to do neck muscle strengthening exercises to prevent neck pain. Muscle once strengthened it willtake some of the strain that goes through the neck bone.