Strange throbbing/ pulsing in my thigh just above knee

Well i am flat footed and i have the same exact feeling in my knee.

This can also be from a injection that you have when your a child , it is injected into a main vein in the upper left thigh, here the thing: when it's injected it weakens the muscles around the vein. If you exercise the vein pumps though blood to build the muscles , but because the muscle and tissue is around it is weak you can feel a heavy pulse! See its always told to be more serious than it is?! Also, the injection happens to everyone but some people don't feel the pulse as much as other , and it's fine and is normal !

I am having the same thing happen -- very weird.. not as severe as some of you have experienced.. but I'd say 2-3 times an hour... lasts about 20-30 secs long.. full on vibration. I twisted my ankle playing soccer last week and was in bed resting with the foot elevated for a while.. reading some of the posts here, I'm wondering if the lack of activity is causing this. Getting back to my daily schedule slowly - so I'll (here it goes again) post updates as they happen. If anyone has any other ideas out there, do post. Thanks ~Jay.

ive been having the same feeling in my legs, it is sometimes in either leg. I'm only 15 but had this happen a few years ago. When it happened a few years ago I had gone to the doctor, but the doctor said he never heard anything like it before. It's starting up again, can it be because I have really flat feet. I've got a new doctor now so if it continues then I'm going to go get it checked out for a second opinion. Does anyone know what this could be?

 i have a pulsating in the middle of my right thigh, it comes and goes, when i lay down or driving my car, sometimes it's rapid,sometimes its slower, but it is not painful, but annoying.

I am a thirteen year old girl, and I have this too, but on the back of my thigh about 3 inches about my knee. It usually comes when I'm lying down with my laptop on my lap with my leg bent a little bit. It doesn't hurt but it's really annoying and it just feels like a tiny little pulse that goes along with my pulse. what is this?

I am now alittle more relieved knowing that others are going through the same thing! I have throbbing on my right knee-lasts afew seconds,and like all of you,VERY ANNOYING! It started 4 days ago. Has anyone had it disappear and if so,how long did it take to go???????

I have been having this same sensation in the front part of my right upper leg for a week now. I cannot put my hand on my leg and feel it from outside of my skin. The twitching happens when I am sitting down and I have learned today that when I straighten my leg out, the pulsating stops.. It is not keeping time with my heartbeat. It has been happening more frequently the more that the days go by. I wish that it would stop... :-(

My left leg feels the same way as jello going thru a tube.It really feels weird and should I be concern?My legs have been getting weak also.

i have had this problem for literally years, maybe 5 years.  It just happens, whatever deal with it.  it's not a big problem.  Unless i've been lucky for 5 years and not been killed by this crazy condition.  It starts happening about 5 times per 2 months.  Where it just starts throbbing/pulsing for days at a time.  Whatever, i'm so used to it now.

I had a similar thing. It is a muscle twitch/ spasm that can be brought on for no reason at all. But sometimes it is lack of fluids and electrolytes.

I have the same thing happen to me quite often.  I think I generally get it when I've been walking around a lot and then I rest.  Perhaps it's swelling of some sort.  I've never had great knees; they get sore pretty quickly.  Does anyone else remember what they were doing before the pulse thing started?

Finally someone exactly like me! I'm your age. I have the exact same thing, but mine can go from my upper and lower thigh to the back of my lower leg!.. Doesn't hurt at all! But as you said, it is VERY ANNOYING... Once I has a school presentation, and my friend told me that my thigh was vibrating... It was weird, because I even felt it. Anyways, I'm really wondering what this is! It's so annoying, Gosh! .. -.-"

It is due to insufficient energy in that muscle in your leg. i get it often as well. Just make sure you exercise and eat healthy, and nothing should go wrong!

I wonder how many of us are over weight.  I definitely am.  I'm young and healthy otherwise, but I definitely need to lose weight and I am definitely out of shape.