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Overview

What Is Beriberi?

Beriberi is an illness caused by not having enough thiamine, also called vitamin B1. Thiamine helps the body use food for energy and supports the nerves, muscles, and heart. Beriberi can cause mainly neurologic problems, known as dry beriberi, or cardiovascular problems, known as wet beriberi. People at increased risk include those with heavy alcohol use, poor nutrition, digestive conditions that limit absorption, or increased nutritional needs.

Symptoms

Beriberi Symptoms

Neurologic and Muscle Symptoms

  • Tingling or numbness in the hands or feet (peripheral neuropathy)
  • Muscle weakness
  • Difficulty walking
  • Muscle pain or tenderness
  • Confusion
  • Impaired coordination
  • Loss of reflexes
  • Problems with balance

Cardiovascular Symptoms

  • Swelling in the legs or feet
  • Shortness of breath
  • Fast heartbeat
  • Chest discomfort
  • Fatigue
  • Worsening weakness

Causes

Causes of Beriberi

Beriberi develops when the body does not receive or absorb enough thiamine. Because vitamin B1 is needed to convert food into energy and support nerve and heart function, a prolonged deficiency can affect several organs. The cause may be too little thiamine in the diet, poor absorption or storage, or a higher-than-usual need for the vitamin.

  • A severely limited diet may not provide enough thiamine-rich or fortified foods.
  • Chronic alcohol use can reduce thiamine intake, absorption, storage, and use by the body.
  • Malabsorption disorders can prevent the digestive tract from absorbing adequate thiamine.
  • Prolonged vomiting can lead to loss of thiamine and inadequate nutrition.
  • Dialysis can remove some vitamins from the blood, increasing the need for nutritional monitoring.
  • Pregnancy, breastfeeding, or other periods of increased nutritional need can contribute to deficiency when intake is inadequate.

Risk Factors

Risk Factors for Beriberi

Lifestyle and Nutrition Factors

  • Heavy alcohol use can interfere with thiamine intake, absorption, and storage.
  • A diet low in thiamine-rich foods can increase the risk of thiamine deficiency beriberi.
  • Severe food insecurity can make it difficult to obtain enough varied, nutritious food.
  • A restrictive diet without appropriate nutritional planning may lack adequate vitamin B1.

Medical and Life-Stage Factors

  • Malabsorption conditions can reduce the amount of thiamine absorbed from food.
  • Bariatric surgery may affect nutrient absorption and increase the need for monitoring.
  • Dialysis can increase the loss of water-soluble vitamins.
  • Prolonged vomiting can cause inadequate intake and nutrient loss.
  • Pregnancy or breastfeeding can increase thiamine needs.
  • Infants may be at risk when their nutritional intake is inadequate or when a breastfeeding parent has severe deficiency.

Complications

Complications of Beriberi

  • Persistent peripheral neuropathy, which can cause ongoing numbness, pain, or weakness
  • Difficulty walking or reduced ability to perform everyday activities
  • Memory or cognitive problems
  • Heart failure
  • Fluid buildup in the lungs or other tissues
  • Death in severe, untreated cases

Diagnosis

How Beriberi Is Diagnosed

Clinicians review diet, alcohol use, digestive and kidney conditions, medications, and the pattern of symptoms. They examine the nervous system and cardiovascular system for signs of weakness, nerve problems, swelling, or heart strain. Because serious thiamine deficiency can worsen quickly, treatment may begin when beriberi illness is strongly suspected rather than waiting for every test result.

  • Blood or urine tests may assess thiamine-related levels or support the diagnosis.
  • Blood tests and other studies may check organ function and look for other causes of the symptoms.
  • An electrocardiogram or other heart evaluation may be used when cardiovascular symptoms are present.
  • Clinicians may observe whether symptoms improve after medically supervised thiamine treatment.

Treatment & Management

Treatment and Management of Beriberi

Clinicians treat beriberi by replacing thiamine, with the route and dose chosen according to the person’s symptoms and severity. Oral thiamine may be appropriate in some cases, while injectable treatment may be needed when symptoms are severe, absorption is unreliable, or urgent treatment is required. Medical care also addresses the cause of the thiamine deficiency beriberi and any effects on the heart, nerves, or other organs.

  • Oral or injectable thiamine is given as prescribed by a clinician.
  • Heart failure, fluid buildup, or other complications are treated when present.
  • The underlying cause, such as alcohol use disorder or a malabsorption condition, is addressed.
  • Nutritional rehabilitation helps restore adequate energy and vitamin intake.
  • Follow-up checks assess symptom improvement and recovery of nerve function.

Treatment safety

Prompt medical care matters

People with severe symptoms, malnutrition, or heavy alcohol use should not self-treat or delay medical evaluation. Urgent thiamine treatment and care for complications may be needed.

Prevention

Can Beriberi Be Prevented?

  • Eat a varied diet that includes foods providing thiamine, such as whole grains, beans, nuts, seeds, and lean meats.
  • Choose fortified grains or other fortified foods when appropriate.
  • Address heavy alcohol use with support from a healthcare professional.
  • Work with a clinician to manage conditions that interfere with nutrient absorption.
  • Take thiamine or other supplements only as advised by a clinician.

People with persistent vomiting, dialysis, bariatric surgery, severe alcohol use, or another high-risk condition may need individualized nutrition monitoring. A clinician can decide whether thiamine supplementation is needed and how long it should continue. These steps can help prevent beriberi disease when the underlying risk is recognized early.

Outlook and Prognosis

Outlook and Prognosis for Beriberi

Beriberi is often treatable when thiamine replacement begins promptly. Energy and cardiovascular symptoms may improve sooner than nerve symptoms, while numbness, weakness, or difficulty walking can take longer to recover. When nerve damage is advanced or the illness has lasted a long time, some symptoms may persist even after treatment. The outlook depends on the form and severity of beriberi illness, how quickly treatment starts, and whether the underlying cause is corrected.

When Should You See a Doctor

When Should You See a Doctor for Beriberi Symptoms?

Contact a clinician promptly for unexplained tingling, weakness, trouble walking, swelling, or shortness of breath. Seek evaluation especially if these beriberi symptoms occur with poor nutrition, heavy alcohol use, prolonged vomiting, or a malabsorption condition. Early assessment can identify thiamine deficiency and reduce the risk of lasting nerve or heart problems.

Seek urgent care

Do not wait with severe symptoms

Get emergency care for severe shortness of breath, chest pain, fainting, confusion, rapidly worsening weakness, or signs of acute heart failure such as sudden breathing difficulty and severe swelling.