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Crying is an important safety valve, largely because keeping difficult feelings inside — what psychologists call repressive coping — can be bad for our health. Studies have linked repressive coping with a less resilient immune system, cardiovascular disease, and hypertension, as well as with mental health conditions, including stress, anxiety, and depression. Crying has also been shown to increase attachment behavior, encouraging closeness, empathy, and support from friends and family.

Scientists divide the liquid product of crying into three distinct categories: reflex tears, continuous tears, and emotional tears. The first two categories perform the important function of removing debris such as smoke and dust from our eyes, and lubricating our eyes to help protect them from infection. Their content is 98% water.

It’s the third category, emotional tears (which flush stress hormones and other toxins out of our system), that potentially offers the most health benefits. Researchers have established that crying releases oxytocin and endogenous opioids, also known as endorphins. These feel-good chemicals help ease both physical and emotional pain. Popular culture, for its part, has always known the value of a good cry as a way to feel better — and maybe even to experience physical pleasure. The millions of people who watched classic tearjerker films such as West Side Story or Titanic (among others) will likely attest to that fact.

There are times when crying can be a sign of a problem, especially if it happens very frequently and/or for no apparent reason, or when crying starts to affect daily activities or becomes uncontrollable. Conversely, people suffering from certain kinds of clinical depression may actually not be able to cry, even when they feel like it. In any of these situations, it would be best to see a medical professional who can help diagnose the problem and suggest appropriate treatment.

https://www.health.harvard.edu/blog/is-crying-good-for-you-2021030122020