###Human: Why am I having tingling sensation in hand? ###Assistant: Hello. I went through your post. Tingling sensation in any part is due to nerve irritation supplying the area. In case of hand, it can be due to cervical spondylosis or due to CTS (carpal tunnel syndrome). However, none is serious and can be managed easily. So, no need to worry. You should check your vitamin D level and B12 level. These deficiencies can also cause tingling.