Underweight

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Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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Underweight
Body mass index chart.svg
Synonyms Low body weight
Pronounce N/A
Specialty N/A
Symptoms Fatigue, dizziness, hair loss, amenorrhea
Complications Malnutrition, osteoporosis, infertility, immune dysfunction
Onset Any age
Duration Variable
Types N/A
Causes Malnutrition, eating disorders, chronic disease, genetic factors
Risks Anemia, heart problems, reduced muscle strength
Diagnosis BMI < 18.5
Differential diagnosis Hyperthyroidism, celiac disease, cancer, tuberculosis
Prevention Balanced diet, regular health check-ups
Treatment Nutritional support, addressing underlying conditions
Medication Nutritional supplements
Prognosis Variable, depending on cause
Frequency Varies by population
Deaths Rare, but possible due to complications


An overview of underweight and its implications on health.


Underweight is a condition where an individual has a body weight considered too low to be healthy. It is often defined using the Body Mass Index (BMI), a measure that compares weight to height. A BMI below 18.5 is typically classified as underweight.

Causes[edit | edit source]

There are several potential causes of being underweight, including:

Health Implications[edit | edit source]

Being underweight can have several health implications, including:

  • Immune system: A weakened immune system, making one more susceptible to infections.
  • Osteoporosis: Increased risk of bone fractures due to low bone density.
  • Anemia: A deficiency in red blood cells or hemoglobin.
  • Fertility issues: Potential problems with fertility and pregnancy.
  • Growth and development: In children and adolescents, underweight can affect growth and development.

Diagnosis[edit | edit source]

Diagnosis of underweight typically involves calculating the Body Mass Index and assessing dietary intake, medical history, and physical examination. Additional tests may be conducted to identify underlying causes.

Management[edit | edit source]

Management of underweight involves addressing the underlying cause and may include:

  • Nutritional support: Increasing caloric intake with a balanced diet.
  • Medical treatment: Treating any underlying medical conditions.
  • Psychological support: Counseling for those with eating disorders.

Prevention[edit | edit source]

Preventing underweight involves ensuring adequate nutrition and addressing any medical or psychological issues that may contribute to weight loss.

See also[edit | edit source]

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Contributors: Prab R. Tumpati, MD