What cause a throbbing?

When you feel a part of your leg or even your eyelid throb and you can even see it, is this a muscle item?
its a body thing.
It's more of a blood thing. The blood is pumping harder through that particular spot and because it's pumping harder you can grain it.
yeah its like a nerve spasm
You may have damaged blood capillary or just nerve impulse going astray. A lot of these nerve impulses can be made by put money on movements or injuries.
Throb as in muscle twitch? Stress can do that.

Throb as in pulsing stomach-ache? Inflammation and swelling.
Blood pulsing around your veins causes throbbing from self pumped around by your heart.
If you injure yourself like a sprain to an ankle you feel it throb due to restricted blood flow.
What you are decribing is a twitch NOT a throb, its a short time ago a spasm in your muscle
trapped guts
Your Health
Causes of Wrist Pain a Throbbing Mystery

Listen to this story... by David Kohn

A appendage typing.

Is the wrist built to handle the tasks of modern life? IStockPhoto (c) 2006

Morning Edition, December 7, 2006 · A year and a partly ago, my wrists exploded.

OK, my wrists didn't really "explode"– but it sure felt that way. I'm a weekly journalist, and whenever I tried to type up a story, I would feel a piercing torment.

Typing just a few words was ample to set off the pain. My wrists tingled and throbbed for hours. And the throbbing never went away completely.

I couldn't stop writing altogether, since I earn my living at the keyboard. So, I tried anti-inflammatory medicine, painkillers and, finally, rest. No luck.

I began using a voice recognition program that translates spoken word into manual. It works, but you have to speak slowly and robotically, which feels silly. And. Slows. Down. Writing.

Looking for backing, I began visiting doctors. One appendage specialist said I had carpal tunnel syndrome, an injury to a nerve that runs through my wrist and supplies electricity to my finger muscles.

Another expert disagreed. He didn't know what I have, but said it was definitely not carpal tunnel.

A third diagnosed the strain as inflamed tendons in my wrists. She tried injecting cortisone -- an anti-inflammatory -- directly into the tendons. It made no difference.

Yet another doctor did an MRI and said my wrists looked completely normal.

But they didn't touch normal. In desperation, I began doing research on my own.

I discovered that millions of Americans hold chronic wrist pain. One study found that as many as five percent of the population may suffer from carpal tunnel syndrome. Every year, between 200,000 and 400,000 of us go through carpal tunnel surgery. And surgery works in the vast majority of cases.

Even so, doctors don't own a good handle on what's in actuality happening inside all these sore wrists. To me, that's the most amazing part. There are almost half a million surgeries a year, but not a soul can really explain the underlying problem.

One of the experts I talked to, Mayo Clinic hand expert Peter Amadio, say he thinks the human wrist isn't designed for modern life.

"We're taking an anatomy that have evolved over hundreds of millions of years," Amadio says, "but not necessarily for the purposes we're putting it to at the moment. The human hand is doing lots of different things, using lots of different positions, and lifting calorific things, doing fine manipulations, a variety of different activities, and so these tissues necessitate to adapt. And it's not unreasonable that the adaptations might go amiss in certain cases.

Amadio also think that many wrist problems start with overly sticky tendons. The wrist contains nine tendons, six bones, two bursa, two nerves and a mass of grisly connective tissue binding it adjectives together. That's a whole lot of moving parts in a tight space.

"The tendons adjectives have a lining, and usually, under the microscope, this lining loving of looks like puff pastry, you know, with adjectives those different layers of dough that you can see, like surrounded by a baklava," Amadio says. "And each of those layer slides on the layer below it as the fingers move, that's the normal arrangement. In patients near carpel tunnel syndrome, all those layers are simply fused, or glued together."

Amadio says once tendons are gummed up, they become gooey and scarred. That creates pressure on the nerve, and cause tingling, throbbing and pain.

Maybe that's my problem: layers of muscle are scraping together too much.

But I'm still going to explore another possibility. Some experts think misery in your wrists and fingers may not have anything to do beside your wrists and fingers. One doctor says wrist pain is recurrently referred from the elbow, the neck, the shoulder -- even the back.

I enjoy an appointment to find out more next month. Until, then I will simply have to speak. Slowly. And. Enunciate.

David Kohn, a medical reporter for the Baltimore Sun, is currently on a Nieman Fellowship at Harvard.

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