### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi, about two years ago I injured my head while snowboarding. I blacked out and wasn t able to remember anything. I was fine and continued on with my daily activities, only thing I really noticed was that it was harder for me to remember things sometimes. Now after two years (it has been about two months ago) my head feels lightheaded if I m not laying down. I don t get head aches, but my head gets this weird heavy feeling sometimes; maybe it is the light headed feeling. My vision is fine, still 20/20 with no blurry vision but sometimes my eyes feel heavy. I don t remember where I injured my head but theres a slight dent on the top left side of my skull. I tell myself that its been so long and I was doing fine, but just to be on the safe side I figured I would ask for another person opinion. Thank you

### output:

Hi, welcome to our site. I am Chat Doctor, MD. Read your query. That is a very significant question and I appreciate your problem. I will try my best to answer your query have serious doubts that the memory issue is related to your accident, if it is that long back as you say (that you can't even remember it). The other issue is that the post-traumatic affected memory is usually limited to the duration of the accident. You may not remember the accident, or the duration of the accident, or the things immediately before or after the incident. It does not affect the memory thereafter. So the regular memory should be OK would suggest an MRI brain and a visit to a neurologist to rule out the possibility of AD or PD. I hope this helps you. Inform the reports mentioned above/if any other, so I can be of help further. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Please feel free to ask another query. I would be glad to help you. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)Best of luck.