What causes the rumble sound in your ears that you can volunatrily make but also happens when you yawn?
146988
I know exactly what you're talking about, but I don't know the cause.  From talking to family members, I believe it's normal.\n\nJaw clicking, popping, and locking are symptoms of Temporo-Mandibular Joint Dysfunction, or TMJ.
443189
sounds like sleep apnea.
856454
no idea....but it could probably be cause all the sound gets sqeezed near the water surface like when you through some dough on the wall...and the ripples combine to increase thier amplitude and hence volume
276956
When working out the blood flow is increased to the working muscles. As a result there is less blood and oxygen flowing to the brain triggering the yawn. This is your body's way of increasing the oxygen level in the brain to compensate.\nAs your body accomodates the increased physical demand, the yawning should become less.
775112
It's a sympathetic reaction that makes them contagious.  A yawn happens when your body is not receiving enough oxygen.  You yawn when someone else yawns because of this sympathetic reaction.  Mythbusters did an experiment on this topic on one of their shows.
481912
scientifically it's because your body forces an action to acquire something, in this case it's OXYGEN. breathe deeper or more constantly. try it. if you breathe like about a quarter of your max breathe every 5 seconds you will yawn after a while.
55790
Pinch your nose and it wil equalize your ears. Also chewing gum and yawning helps
47190
The other answer is correct -- there is a difference in air pressure in the space behind the eardrum (called the middle ear) and the air outside.  This can happen when the Eustachian tube that connects the middle ear space to the back of the throat is not opening properly as it should when yawning or swallowing.  \n\nThe causes of this can be inflammation due to a cold or allergies.  Some people have problems due to enlarged adenoids or tonsils.  Other conditions can also cause the sensation of pressure in the middle ear, but are typically accompanied by other symptoms like spinning dizziness (vertigo) or ringing/buzzing in the ear (tinnitus).  Ear wax (cerumen) build up can make you feel clogged, but doesn't usually cause a popping sensation.  \n\nA quick fix is to hold your nose and mouth closed and blow gently, which will force air pressure up into the middle ear space.  This is called the Val Salva maneuver.  Some people respond well to nasal allergy sprays or other allergy treatments.  If the problem persists for more than a week or two see your doctor or an Ear, Nose and Throat specialist.
309172
padillio is right. it is just a mental thing, and she is also right in saying that it is because of a lack of oxygen. it is also associated with being tired b/c when you're body is fatigued or tired, you're breathing slows down and you get a lack of oxygen. yawning is an involuntary muscle movement to make you breath heavily and take in more oxygen. anyway, that's pretty much it.
525329
I get that a lot and find it really annoying too. I usually get that noise in my ears after listening to loud music etc. If your hearing is affected then maybe ask your GP for a hearing test to check it out.
222830
There could be a multitude of reasons. Yawning is caused by a lack of oxygen to the lungs. You yawn because it allows an immense amount of oxygen to your lungs.
292528
Yawns usually occur because you have some lack of oxygen, usually when you are growing sleeping and not breathing properly. When a person yawms next to you, you usually stop breathing yourself, thus triggering a "contagious yawn." Need to prove this false? Next time you see someone yawn, be concious of it and make yourself take a deep breath. You wont get that contagious yawn!
1177906
Yawning is your body's attempt to get more oxygen.  When you are tired, your breathing tends to get more shallow, and your body tries to compensate by making you yawn - bringing in more oxygen.\n\nHere's some more information on yawning, and why it's "contagious".
1077119
That always happens to me, but it has to do with my asthma.  Asthmatics sometimes don't get enough oxygen as a normal person would with ordinary breaths, and thus have to take deeper breaths (probably without realizing it) to get the job done.  I often find myself doing that... and yawning can have to do with that as well.  Sometimes when exerting a lot of energy, my asthma kicks in just a little bit, and I start yawning.\nAnxiety could also cause this.\n\nAlso it could just be that your other breaths, that aren't so deep, aren't bringing in enough oxygen-- so you have to rectify that by breathing more heavily every so often.\n\nIf you find it happening in certain locations, such as only at work-- it could be that the ventilation isn't that great, and fresh air isn't coming in as much as it should.\n\nAlso, being around a lot of smoke certainly won't make your lungs work any better.\n\nAll in all, there are a lot of explanations... I would just mention it to your doctor next time you go.  If it gets any worse, you should make an appt to see him.
542822
yawning is usually a result of a slight lack of oxygen. therefore if one person yawns, the same conditions exist for others in the room.
123342
This might help\n\nhttp://www.world-science.net/exclusives/050309_yawnfrm.htm
968219
you hear a noise because someone is making noise for people to laugh. you answered your own question.