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Kinda a vague question. Did it just happen or slowly start happening immediately. But things to make your wheel shake:
1.Wheel lost its balancing weights and needs balance.
2. Worn or broken front steering / suspension components.
Ball joints, tie rod ends, drag link, etc...
3. Loose wheel.
Your going to have to investigate yourself. Basically it could be a number of things. Dont drive it though. Lift the front end off the ground and just find out whats loose. Shake the wheels (safely) turn the steering wheel and look for play.
If its minimal, looks for lost wheel weights and get the front tires balanced. Are the tires in bad shape?