What causes tachycardia/pounding heart wheb laying down? Not anxiety

See a doctor. arrhythmia,which mean abnormal heart beat,could be simple tachycardia easy treat it with medication. or it could be complicated and with consequences, like atrial fibrillation could cause a clots to the vital organs in the body like brain with stroke or kidney or guts. or it could be a bad tachycardia that could lead to fibrillation and cardiac arrest. so please see a doctor.
Tachycardia. There might be a number of reasons, do you have overweight problem ? Do you feel extra - skipped beats. Your doc should be able to tell why you have these symptoms after examining you.

Related Questions

What type of arrhythmia can cause pounding heart/tachycardia and rapid breathing numerous times a day? It's really bad after eating.

Any one of. the tachy-dysrhythmias that are are coordinated enough to be functional. The only way to determine is by ECG which I would recommend be done today. Read more...
Many types . there are many types of arrhythmias that can cause that feeling. The best thing for you to do is see a doctor and have a holter monitor placed. That will give you a better idea of what's goong on. Read more...
Need examination. Taking into consideration what you have said of your self under "conditions" with weight loss being part of that my guess is that something metabolically in your system is not right such as your thyroid gland or possibly your adrenal glands. I do not think this is an inherent arrhythmia of the heart or some type of tachycardic syndrome. You need to be worked up with blood, urine, & imaging studies. Read more...
Likely SVT. A variety of arrhythmias can do this but it is most like a supraventricular tachycardia caused by a release or hormones or surge after a large meal. If you have an otherwise normal heart (on echocardiogram), then it is not dangerous but can be treated with medications if need be. Read more...

What can cause me to wake up with a pounding heart and dizziness in the middle of the night. Not nightmares or anxiety?

Anxiety. I feel empathy for your Ponding heart and dizziness in the middle of night .and headache and abdominal pain. At age 34, unresolved emotional conflicts, stressors of relationships,. Marriage, Separation, divorce, parenting, work, finances and children leaving home can cause emotional turmoil affecting sleep, cause physical symptoms and anxiety. See a Psychiatrist. for Therapy and medication. Read more...

I'm constantly waking up lately with a pounding heart. What would cause this? . No breathlessness or pain. I suffer with fibro & anxiety.

Excess awareness . If you are generally healthy, in your age group, it is often due to "getting lost in your head" as you try to relax. It is more noticeable at night since it is quiet/dark (=less other inputs), and you are lying down. If you are thin, that can further increase this. If you count your pulse while lying there and it is between 50-90 and regular, it is unlikely an emergency. You can always ask your md. Read more...

Does pounding heart or tachycardia increase increase oxygen absorption in the lungs?

Complex. The heart and lungs work together and respond to each other on many levels. Giving extra oxygen can lower a rapid heartbeat, but the fast heart rate does not necessarily increase oxygen absorption in the lungs. It depends on how fast the heart is beating, why it is beating fast, and the status of the lungs (ie diseased lungs from any cause are not as good at picking up oxygen as healthy lungs). Read more...
Tachycardia. It does not necessarily increase the oxygenabsorption in the lungs as it all depends on hte time the blood in the pulmonary veins stay in the lungs. It is not related completely on the heart rate. Read more...

What are the risks of constant anxiety and almost a constant pounding heart?

Anxiety. I think you realize you need to take care of this see your dr., dr will check for hyperthyroidism and other conditions. If needed perhaps you can get some psychological help. Read more...

Arrived 2 days ago in Tokyo from London. I have been going to bed at midnight and normally wake up 2 hours later with pounding heart and anxiety.

A few thoughts. Hi JoaoC, Sorry to hear you've been struggling with sleep. Good sleep hygiene can be a challenge with international travel. Common causes for symptoms like this are subconscious stress, alcohol use before bed, nicotine withdrawal, caffeine withdrawal, in combination with drastic time changes. Here are some tips on sleeping better while traveling http://wb.md/2ovIrfk Hope this helps. Read more...