It can be. Crying is a natural emotional release. Sometimes, a "good cry" is exactly what the doctor ordered (ask any woman, if you're a guy). That does not mean, of course, that it is always a good thing - constant crying is a red flag for a serious emotional disorder.
No but it is still not healthy
No, crying is a natural human response to certain emotions or situations. It serves as a way to release built-up emotions and can provide a sense of relief. Crying can be a healthy and normal expression of emotions.
A baby crying.
Crying is not likely to affect your physical health significantly.
sobbing
say i have really bad allergies
Puppies always cry, you can expect it to happen for a long time. They cry for milk, for communication... just about anything. Crying just means they are healthy, in fact I would be concerned if they WEREN'T crying.
boohoo (like someone crying) : "bouhou"
no because then it will make them laugh
ANSWER: Your question is a bit different, if your asking why someone cry for love , could it be this person was hurt and betrayed? There are different meaning when we talk about love and emotion ( crying thing), the worst scenario is if our heart is broken, there will be pain and this pain will turn to crying. Crying can make someone feels a little better inside.
Not a black eye no. But your eyes can get red and swell up from excessive crying.
If you see a friend crying in your dreams, then someone close to you is struggling and you are wishing you could help. If the person crying in your dreams is an enemy, you are seeking to hurt this person emotionally.