My mom and I went through the same battle.
Of course there really was something wrong with my knees.
My knee would pop, and I could FEEL it popping with my hand on my knee every time I bent my knee. It hurt to walk, sit, stand, lay down - anything.
So I went to a doctor and the doctor said that I had tendonitis and that I should ice it and heat it and he gave me some home exercises. Yeah... that didn't work. So a few months later I went to a different doctor and she told me that I had Chrondromalatia Patella; which is a softening of the cartilage behind my kneecap. So we did an MRI and it came back completely normal. So we did physical therapy for a while and it got better. But then we went on vacation to DC and it got really really bad.
Turns out, I have a abnormal piece of tissue that is sliding under my kneecap, which is what is popping every time I walk. This condition is called Plica. It doesn't show up on MRI or x-rays. I had to go through a steroid shot under my knee cap - no pain killer, just a four-inch needle stuck in my knee. Then we ended up doing surgery. My other knee has the same problem and I'm having surgery on it in two weeks.
Since you don't know why your knee is hurting, it could be growing pains - but that is really unlikely, with the bumping it and for three weeks? Not likely, possible, but not likely. For the time being, and since your mom doesn't believe you, just take it easy. Get an Ace wrap and wrap it up or get a brace. My brace came from Walmart and it's Muller brand. That's what my orthopedic surgeon told me to use, and she told me a few places to get it, and those places were SO expensive. I got the same brace at Walmart for 20 dollars less.
If your knee is swelling then you should put ice on it. Even if it doesn't swell, but ice makes it feel better - ice it once or twice a day for fifteen minutes or so. Ice only helps for the first fifteen minutes it's on your body. After that all it's doing is freezing you. Take Ibuprofen or Advil as directed on the bottle. Something like Tylenol won't help with the swelling, and often the swelling is what makes your knee hurt so much.
If your knee is still hurting in a couple of weeks, mention it to your mom again and ask to go to your family doctor.
I sincerely hope you don't have to wait three years for a real answer, like I did. Get well soon!
[thewretchedmelody]
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