Without enough thiamine, a person’s body cannot create all the energy the person needs. As a result, people with beriberi have severe lethargy and feel exhausted. Beriberi can also cause muscles to get weaker. These symptoms can make it hard for a person to do simple things.
Most people get enough vitamin B1 in their regular diet. However, some groups are more likely to get beriberi. These include people who drink a lot of alcohol and people who eat an unhealthy or unbalanced diet, like a diet of mostly white rice.  
Most of the time, dry beriberi and wet beriberi happen at the same time in the same person. When this takes place, the victim is likely to only get the symptoms of one beriberi.
- "Vitamin B1 (Thiamine)". Mount Sinai Health System. Retrieved 20 January 2022.
- "Beriberi." World of Scientific Discovery. Gale, 2007. Student Resources in Context. Web. 22 Feb. 2016.
- "Beriberi - PubMed Health". ncbi.nlm.nih.gov. 22 July 2010. Retrieved 23 May 2011.
- "Beriberi." Karen Ericson, RN. The Gale Encyclopedia of Neurological Disorders, Second Edition. Ed. Brigham Narins. Detroit: Gale, 2012. 2 vols.