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www.reference.com/science/people-cry-85062c8f4374f33c

Crying is an emotional response to many different feelings, including sadness, anger, happiness and pain. People cry for an emotional release and also as a survival mechanism to signal to themselves that they need to address a certain situation in their lives that is causing them stress.

www.reference.com/pets-animals/dogs-cry-570aab529790ad0b

Dogs cry for several reasons that include anxiety and hunger. Dogs do not shed tears like humans when they are upset or agitated. They express their emotions through high-pitched whining and moaning that is often accompanied by trembling.

www.reference.com/article/crying-healthy-4912c83ec5f0e31d

Research suggests that crying may help to flush negative chemicals out of the body. There are three types of tears, each with different benefits and causes. Frequent crying is not always good for a person.

www.reference.com/article/crying-make-tired-88b00365b437ca69

Crying makes a person feel tired for a variety of reasons, the most significant being the powerful emotions and natural release of tension that comes as a result of shedding tears. Scientists believe that crying releases stress hormones and toxins from the body, according to WebMd.

www.reference.com/article/cat-crying-619a347ae32e7d6a

According to Web MD, a cat's excessive crying or meowing can be caused by illness, hunger, or even simply wanting attention. Each cat is different and may vocalize for different reasons, so it is best to find the cause and narrow down the reason for their communications.

www.reference.com/article/people-cry-sad-e1994505ebc5e8f9

It is believed that crying when sad is a physiological way for the body to release stress. It also may be a way for the body to signal a need. Such needs may be internal or external.

www.reference.com/world-view/top-head-hurt-225cfb38a064eabe

Pain may occur at the top of the head due to sinus headaches, tension headaches and migraines. A sinus headache is the result of congestion and inflammation of the sinuses, according to University of Maryland Medical Center. Causes of tension headaches include stress, poor posture, hunger and lack o

www.reference.com/article/someone-s-head-hurt-a15375c76f54dfa1

A person's head may hurt as the result of a primary headache syndrome or an underlying medical condition. Approximately 90 percent of all headaches are considered primary headaches, according to Cleveland Clinic. Secondary headaches are caused by a variety of conditions, some of which are life-threa

www.reference.com/article/babies-cry-sleeping-e43bd6c850c898ab

The University of Michigan Health System reports that it is normal for babies to sometimes cry while they are asleep, since they experience the same REM sleep cycle of adults. The University suggests that parents wait to respond to a crying and sleeping infant as this is a normal response to dreams.

www.reference.com/article/onions-make-cry-bc669903e66a69d4

Cut onions release amino acid sulfoxides, which the eyes perceive as an irritant. The eyes react by flushing the irritant out using reflex tears, a type of tear designed for this purpose.