Specific withdrawal symptoms can wary depending on the substance a person was using, the amount the person was using, and how long they have been using that substance for. The more used to a drug a person’s body is, the worse the withdrawal symptoms will be. In very extreme case, withdrawal can lead to death.
In general, withdrawal symptoms tend to be the opposite of the effects of a drug. For example, if a drug helps you sleep, you will likely suffer from insomnia as you are going through withdrawal.
Withdrawal from Depressants:
Change in perception of light, sounds, smell, etc.
Withdrawal from Stimulants: