Traits

Traits linked to SI

sucrase-isomaltase

The Human Phenotype Ontology links 17 traits to SI, by body system: features seen in people with one of the gene's rare conditions.

Abnormality of the digestive system

Trait	How often it is seen
Diarrhea	Always
Abdominal pain	Very often (80–99%)
Acid reflux	Often (30–79%)
Constipation	Often (30–79%)
Flatulence	Often (30–79%)
Nausea	Often (30–79%)
Poor appetite	Often (30–79%)
Vomiting	Often (30–79%)
Abdominal bloating	Sometimes (5–29%)
Abdominal colic	Sometimes (5–29%)
Bloody diarrhea	Sometimes (5–29%)
Loss of bowel control	Sometimes (5–29%)
Malabsorption	Not recorded

Abnormality of the genitourinary system

Trait	How often it is seen
Kidney stone	Not recorded

Constitutional symptom

Trait	How often it is seen
Fatigue	Sometimes (5–29%)

Growth abnormality

Trait	How often it is seen
Faltering weight	Rarely (1–4%)

Laboratory abnormality

Trait	How often it is seen
Decreased mucosal sucrase-isomaltase activity	Not recorded

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Where this comes from

The Human Phenotype Ontology, release 2026-09-01: the traits linked to SI and how often each is seen. Find out more at hpo.jax.org.

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