When you're crying, your lips may quiver due to a combination of physiological and emotional factors.
Emotional response: Crying is a natural emotional response to various stimuli, such as sadness, joy, pain, or stress. When you experience intense emotions, your body's autonomic nervous system is activated, leading to various physical reactions, including trembling or quivering of the lips.
Muscular tension: Strong emotions, especially during crying, can lead to increased muscular tension throughout your face and body. The muscles around your lips may contract or tremble as a result of this tension.
Connection to facial nerves: Your lips are richly supplied with nerve endings. When emotions are running high, the activity in these nerves may increase, causing the lips to quiver.
Impact of crying on breathing: During crying, there are changes in your breathing pattern. You might take irregular, deep breaths or hold your breath momentarily. This can influence the muscles around your mouth and cause the lips to quiver.
It's essential to remember that crying is a normal and healthy way for humans to release emotions and cope with various situations. If you find yourself experiencing frequent and overwhelming emotional responses, it may be helpful to talk to a mental health professional who can provide guidance and support.