The presence of generalized stiffness may first be related to cold stimulation and exertion, which can lead to muscle spasm and muscle stiffness throughout the body. It is also possible that there is a brain disease or injury to the spinal cord that causes paralysis of the upper motor neurons, which can lead to increased muscle tone and muscle rigidity throughout the body. So it is important to conduct an examination to determine exactly what is causing the problem. If you are currently moving freely and only have muscle stiffness, you can apply heat and massage first, rest well and exercise in moderation. If the muscles of the whole body are tense and the movement of the limbs is abnormal, a cranial MRI and a cervical MRI should be done to determine the specific cause. Treatment can be applied to reduce muscle tone drugs, such as baclofen, clonazepam, botulinum toxin, etc.