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These conditions accompany other symptoms, which vary, depending on the underlying disease. It can include dehydration, chronic fatigue syndrome, Parkinson’s disease, hypoglycemia or many more. These are the few medical conditions, which can be the reason for these symptoms.  

Factors that cause’s sudden onset of weakness, shakiness, or tiredness

Many factors are involved which can cause such condition. This includes 

• Dehydration: This occurs when a person loses more fluids than getting enough fluid, causes low blood pressure, result in weakness, fatigue, dizziness and vomiting.
• Hypoglycemia: This is a condition in which blood sugar are abnormally drop. Condition results in shakiness, anxiety, fatigue, weakness etc. 
• Low blood pressure: This occurs when a blood pressure of a person is lower than 90/60 millimeters of mercury. Low blood pressure symptoms include bleeding, heart problems, weakness, tiredness, trembling etc. 
• Sleep deprivation: Sleep deprivation occurs when there is consistent lack of quality sleep, which compromise basic body functions. It causes fatigue, weakness etc. 
• Too much caffeine: Healthy adults can consume caffeine to a limit range but higher doses can be harmful. Many people are more sensitive to caffeine and experience negative effects even at lower doses. Symptoms include shakiness, weakness, and tiredness. 
• Medications: certain medicines may also produce these symptoms.

Associated medical conditions

Several medical conditions are there which brings the feelings of weakness, shaky and tiredness. The following are as given below:

Tremors

Tremors is a rhythmic, involuntary muscle contractions, which lead to shaking in one or more parts of the body, which can occur in any age, but likely affect middle-aged and older people. 

This disorder most frequently affects the hands but it may also affect the arms, legs, vocal cord, torso, or head as stated by National Institute of Neurological Disorders and Stroke.

Irregular heart rhythm (heart arrhythmias)

This condition occurs when the heartbeat does not function properly i.e. either the heart beats too fast or beats too slow or irregularly.  Due to abnormal heart rate, the heart cannot pump blood effectively, which can cause weakness and tiredness. According to the American Heart Association (AHA), Arrhythmias can be harmless or life threatening.

Chronic fatigue syndrome

Chronic fatigue syndrome is a serious, long-term condition that involves many systems of the body. It is characterized by extreme tiredness which doesn't go away with only rest. This worsen the medical and physical conditions. Symptoms include severe tiredness, sleep problems, and difficulty in thinking. This condition makes the people difficult to perform day to day activities as per Centers for Disease Control and Prevention (CDC).

Parkinson’s disease

Parkinson’s disease is a long term brain disorder that cause an individual to lose control in some body parts, left with shaking, stiffness, and balance problems. According to the National Institute on Aging (NIA), symptoms usually starts gradually and worsens over time, which make difficulty in walking and talking. 

Prevention

Treatment of these conditions depends on the underlying medical conditions. It is advisable to get the treatment based on the medical conditions.

For instance, if someone showing the symptoms due to hypoglycemia associated with diabetes, a doctor can prescribe anti-diabetic medication like insulin or other drugs. Likewise, if an individual’s symptoms are due to tremors, anti-seizure medications may be recommended to reduce such symptoms.

Some lifestyle modification can also improve these conditions and so overall health. If this is not working, needs to consult doctor. 

Many blood test and Laboratory tests are recommended by the doctor based on the medical conditions. 

The best way to determine the cause is to contact a doctor.

Home remedies

The conditions of feeling weak, shaky, and tired may be due to a number of conditions or other factors. Some causes can be easily treated while some depends upon the medical conditions that occur in the individuals. Lifestyle change can be one of the effective treatment in this case. 

Reduced caffeine intake will help reduced symptoms as too much caffeine consumption may cause to produce such symptoms. 

Dehydration is another condition that a person can treat easily, so getting enough fluid will help to overcome with these symptoms.

Taking Nutritious diet is another important way to reduce tiredness and weakness, which in turn improves overall health by just increasing the energy and thus reduced the risk of developing serious medical conditions, as said by National Institute of Diabetes and Digestive and Kidney Diseases. As per CDC, nutritious diet includes: 

• Fruits, vegetables, whole grains, and low fat dairy products.
• Foods rich in protein like fish, poultry, lean meat, beans, nuts, and eggs.
• Avoid or limit foods that are high in saturated fat, Trans fat, salt, and sugar.
• Daily calorie intake that falls within the recommendations.
• If a large meal is difficult to eat, small and frequent meals are preferable. 
• Physical activity also offers excellent health benefits and can help a person feel stronger. 

Summary

Feeling weak, shaky, and tired may occur due to many reasons, which sometimes can be easily treatable but due to some serious medical condition, treating option is difficult. In this case it is advisable to contact immediately to the doctor