Vitamin B1 (thiamine) deficiency causing heart failure (wet beriberi) or neurological issues (dry beriberi)
For the 100% level, medical records documenting a diagnosis of congestive heart failure, anasarca, or Wernicke-Korsakoff syndrome during active disease are central. Cardiology or neurology notes, hospitalization records, and imaging are examples of records that could reflect these conditions.
For the 60% level, records showing cardiomegaly on imaging such as chest X-ray or echocardiogram, or neurology exam findings documenting footdrop or measured atrophy of the thigh or calf muscles, would be relevant.
For the 30% level, nerve conduction studies or physical exam findings showing absent knee or ankle jerks and sensory loss help establish that tier. Your own statements, or statements from people who know you, describing how weakness, fatigue, dizziness, leg heaviness, headaches, or sleep problems affect your work and daily activities can also support this level.
For residual disability after active disease resolves, the evidence needed depends on which body system is affected, since VA will rate those residuals under the criteria for that system.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.
