Hello dear Stiffness in neck could be due to any of following 1. Cervical spondylitis 2. Local muscle injury or muscle pull 3. Brain disorder (rare) I would advise you for few investigations like X ray cervical spine or an MRI If you can provide more details like your age and complete history of these symptoms, I will be able to guide you better In my opinion you should take ibuprofen tablets for pain and physiotherapy like infra red or inferential heat therapy You should correct your posture and gait If it worsens then you should consult a neurophysician for detailed check up Hope this answers your question Thanks for your question Get Well soon