Can anyone give me a site or references which explain everything about some dise!

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Moustafa,
If you want to be a good student you'll have to understand that you not only want the current knowledge base but also need to know the direction of research in a particular area. There are no quick answers. You're going to have to read and think for hours.

For example you can find fairly complete lists of Parkinson's disease symptoms at many websites but it is sometimes difficult to find the precursor symptoms (a key to dopamine neuron degeneration) of the disease listed at the same site. Once the common symptoms appear when 60-80% of dopamine neurons in the SN have been lost along with substantial numbers of norepinephrine neurons as well as an change in serotonin levels, there are still differential diagnoses which you will have to study as well.

Recently it has become possible to see the lists of those early warning signs because early intervention might have a significant impact upon the progression of PD.

For diseases and conditions for which there is no cure, there is no one-stop-answers-all. You are going to develop trusted sites and learn how to use them to lead you to more information.

I also suggest that you get free subscriptions to some of the newsletters from medical journals and institutions. If you have specific interests, you can subscribe to those interests by entering the keyword search with your subscription. I warn you, it can be almost overwhelming.
http://diabetes.diabetesjournals.org/sit…
I link the research information at BMJ - check it out:
http://group.bmj.com/

Let's take Diabetes and Parkinson's as examples of sites you can learn to use. A site such as WebMD is basic but will give you a patient approach to understanding. And that is what you might need now.
http://diabetes.webmd.com/
Using Wikipedia is not without risk - most information is from other articles. To expand your knowledge base and comprehension, click on the various links as you read down the page. If you haven't used the footnote links as you scrolled down, pay careful attention to the references at the bottom of the page. You will learn which sources you want to use for more information.
http://en.wikipedia.org/wiki/Diabetes_me…

There are also medical centers with good basic information. The Cleveland Clinic (much of WebMD is from that hospital complex), the Mayo Clinic are just two resources for basics. Of course you shouldn't forget to check John's Hopkins for any disease because if you look at hospital ratings, they are right up there.
http://www.mayoclinic.com/health/diabete…

Don't overlook the value of the National Institutes of Health - you can also read about clinical trials for specific diseases when you will see symptoms discussed in a practical way - below is a link to Diabetes:
http://diabetes.niddk.nih.gov/dm/pubs/ov…

Here is the link for ALL clinical trials - choose your disease:
http://clinicaltrials.gov/

You can often find interesting information by searching patent info - explanations of conditions will often be given in great detail.

As a medical student, you have access to texts and libraries - don't be afraid to use them as well. And don't be afraid to read about alternative medicine. The best treatments for Parkinson's disease seem to involve not only conventional medications (prescriptions) but also nutritional supplements, diet, a variety of exercise therapies, medical massage, voice therapy (also a physical therapy) and specialized vision, dental and psychological treatment. If you can learn why the additional therapies work for PD, you might have a better understanding of both the disease and the particular patient.

Just as there is no one set of symptoms, no standard rate of disease progression in Parkinson's, so there is no one absolute medication or treatment. More physicians need to learn to treat the patient and not just the disease, But first you need to learn about the disease.

Another good site is to read what patients have to say about their conditions, their experiences with treatments and therapies. I suggest two more sites. The first is for movement disorders such as Parkinson's disease - you will find plenty of disease/condition information and also a discussion area:
http://www.wemove.org/par/
For patient input and medication information:
http://www.patientslikeme.com/parkinsons…

As I said, there are few definitive sites - you would do well to set up files and select from a broad information base. You can set up symptom files, differential diagnosis files, treatment files, research files within each condition. But know that even among the conditions you mentioned, there will be common symptoms although the mechanism may not always be the same.

There are no magic answers - there is no one compilation of knowledge - treatments are subject to change. If you are going into this field, your learning process should never stop. You are right, begin with the basics.

Co-administrator
htttp://parkinsonsfocustoday.blogspot.c…

Do you want to understand the diseases? Or just what how the body gets once there is problem.

Most of the diseases you mention come about due to deficiencies.

If you are a medical student you have many books already on the subject. Look further simply by searching diabetes.

I like webmd and medscape. The websites that are the best are really expensive ones.