why do tears come when we cry?
452773
Tears flow from our eyes when we cry because they contain chemicals and hormones produced by our bodies.\n\nWhen we become upset, our brains and bodies overreact and work overtime by producing chemicals and hormones.\n\nCrying helps eliminate these extra chemicals that we don't need.\n\nThe chemicals and hormones disappear from our body through the form of tears. As our tears flow, they sooth our sadness or distress by withdrawing these chemical agents.\n\nThat is why many people feel calmer or more refreshed after crying--because the tears get rid of these hormones that are produced when we are sad, happy, or distressed.
439591
Tears come from tear ducts, not directly from your eyes. Your sight is a direct result of your eyes. The two are independent of each other.
48601
They are produced by our tear glands which are found in a region just above our eyes.  They are stimulated to secrete tears by feelings such as sadness.
1001761
Probably because something is bothering you.\n\nMaybe in your love life???\nThat was the problem for me.\n\nOr it could be you are depressed about something.\n\nHave you talked to your friends about this I mean maybe they have noticed changes in your life you haven't really noticed and maybe they can help yuo figure it out.\n\nI hope you don't have to cry anymore. it sucks to cry although it feels good to let all your upset and hurt feelings out.
363532
To begin with, something upsetting has happened to bring you to the point of tears.  This in itself is stressful.  Stress and tension break down the ammune system and can lead to illness over time.  So, when you cry, and I mean really sob, your body is releasing stress, sadness, perhaps anger, and all around tension.  It isn't just the crying that is tiring, it is the emotional drainage.  Did you know it takes more muscles to frown than to smile?  I've cried quite a bit, I'm kind of an expert, tee hee.
393029
It is a response tiggered by emotions configured in past experiences.\nCrying is a more complicated process than one would at first imagine. First of all, there are really three different types of tears. Basal tears keep our eyes lubricated constantly. Reflex tears are produced when our eyes get irritated, like with onions or when something gets into our eyes. The third kind of tear is produced when the body reacts emotionally to something. Each type of tear contains different amounts of chemical proteins and hormones. Scientists have discovered that the emotional tears contain higher levels of manganese and the hormone prolactin, and this contributes in a reduction of both of these in the body; thus helping to keep depression away. Many people have found that crying actually calms them after being upset, and this is in part due to the chemicals and hormones that are released in the tears.   \n\nHow then actually do we cry? The psychic tears (or emotional tears) require an emotional response, or trigger to be activated. This response can be caused by an outside source, either pain or loss of love, etc., or from an inside source (self-realization of one's life and others). When emotions affect us, the nervous system stimulates the cranial nerve, in the brain and this sends signals to the neurotransmitters to the tear glands. Thus, we cry .The largest tear gland, the lacrimal gland produces the tears of emotion and reflex. Many believe that the body, in times of emotional stress, depends on this gland to release excess amounts of chemicals and hormones, returning it to a stable state.
518869
Crying is an emotional reaction to a thought or stimulation, just like joy or anger.  Any emotional reaction produces a release of adrenaline and hormones into the bloodstream causing the body muscles to tense up for a fight-or-flight response.  However, this release can over produce adrenaline and actually cause your diaphragm - a muscle moving the lungs - to stiffen and stop breathing.  If severe enough, the adrenaline can even produce heart attacks.
972647
A few reasons I can think of.\n\nWe spend a lot of our times pretending we're stronger than we are, and it all goes to waste when we break down and cry in front of other people. We feel a need to defend our humanity and apologise for the tears.\n\nPerhaps we don't want to burden others with our emotions, so we try and keep them to ourselves and apologise for letting them out.\n\nSometimes we just *need* to cry, or we'll break down and do it regardless. Some people might apologise for that need to be emotional.\n\nI'm sure there are more, but really it depends on the circumstance.
468721
Because we get so filled up with emotions that it spills out of our eyes!
258080
You can't.  It's just your emotions flowing out. I am like that too.  Don't worry.  It's ok if you cry a lot.
842275
It is part of grieving.   Crying can be a release of  all of the emotions that center around the loss of someone.    I would say it is an important part of working through the grief for some people.  It allows them to move on with their life after having experienced  a loss.
288262
The reason why our noses get stuffy when we do cry is that when we cry, we \nmake more tears. While some of the tears run out of our eyes and down our \ncheeks, more of the tears run directly into our noses. This is because \nthere is a tear duct (or tube) called the nasolacrimal duct that runs from \nour eye sockets and drains into our noses. When we are not crying or \ntearing, the excess tears drains into our noses. However, it comes as a \nsort of slow drip, so it does not cause stuffiness or runny noses. \nInstead, is slowly runs into the back of your throat, and you swallow it. \nHowever, when crying and other things make you tear a lot (like onions and \nallergies), more tears come through this tube and into our noses than our \nnoses can handle. This makes our noses feel runny or stuffy.
530166
I would assume it's because crying requires a lot of pressure placed on the thoracic cavity (like when you go to the toilet and close the windpipe while exerting pressure with the diaphragm, the valsalva manoeuver). that changes the cardiac pace (venous return, preload, etc. etc.) and well, the strength with which you do it causes strain on the rib cage (i'd more emphatically think your pain is of the cartilage and membranes around the sternum, not quite so much of the heart.
44872
Tears can be an expression of Joy....One of lifes most wonderful joys is falling in love and having your love wanting to spend the rest of their life with you. P.S.- Women aren't the only ones who cry, I cried when she said yes.
474228
Regardless of whether or not you feel sad, crying is a way for your body to release built up tension and stress. Ever been under an enormous amount of stress, then you hear a somewhat-funny joke and begin laughing hysterically...only to find yourself "laughing" so hard you're crying? Laughing is also a way for your body to release this tension. Your body is a miraculous machine and it needs to release negative energy in some way to keep on running. Perhaps you've been extra busy lately, or have had an extra amount of stuff on your mind...? Either way, your body is trying to regulate itself. It's nothing to be worried about.
810057
Astronauts can indeed cry in space. Tears run down your face because of gravity, but they don't need gravity to form. When the tears get big enough they simply break free of the eye and float around.
461204
Our sinuses, ears nose and eyes are all connected. So when you cry you will experience symptoms in one or sometimes all of these areas. As for the hiccups it is because we forget to breathe properly while upset. We either hold our breath or hyperventilate.