When a guy likes someone, there may be some physiological reactions, but everyone may react differently. Here are some possible physiological reactions:
1.Rapid heartbeat: When a guy sees or interacts with someone he likes, he may feel his heart racing.
2.Red face and red ears: Due to the effects of hormones, boys may feel their faces warm and red.
3.Dry mouth: When facing someone they like, boys may have a dry mouth due to nervousness.
4.Eye contact: A guy may try to maintain eye contact with the person he likes or look at her frequently.
5.Body orientation: When a guy likes someone, they may unconsciously turn their body towards the other person.
6.Change in intonation: Boys may become softer or louder when communicating with someone they like.
It is important to note that these physiological responses are not absolute, and each person's body may react differently. In addition, these reactions may also be influenced by other factors such as mood, environment, etc. The most important thing is to know how a person really feels by observing his behavior and attitude. 
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