Swedish study links childhood physical illnesses to higher psychiatric risks in autistic adults, highlighting need for integrated care

A large Swedish cohort study reveals that physical illnesses in childhood are associated with increased mental health diagnoses in young adults with autism, emphasising the importance of holistic healthcare approaches.

A Swedish register study has found that autistic people who had physical illnesses in childhood were more likely to be diagnosed with psychiatric conditions in early adulthood, adding to evidence that physical and mental health risks in autism often travel together rather than in separate lanes. According to researchers led by Miriam I Martini at Karolinska Institutet, the pattern held across a population-based cohort of nearly 2 million people born in Sweden between 1985 and 2004, including more than 58,000 diagnosed with autism.

The study, published in The Lancet Child & Adolescent Health, looked at somatic diagnoses recorded before the age of 16 and psychiatric diagnoses made between 16 and 25. It found that chronic pain and migraine were especially closely associated with later mental health diagnoses. The researchers said the links were stronger in females than in males, echoing earlier Swedish work showing that autistic women and girls often carry a heavier psychiatric burden in young adulthood.

Even so, the findings suggest that childhood physical illness is only part of the picture. The study reported that autistic people without recorded physical illnesses in childhood still faced a higher psychiatric risk than people without autism. That points to broader influences, including social and environmental factors, which the researchers said also need closer attention if services are to understand why outcomes differ across the life course.

Martini said the results underline the need to see health as connected across body systems and developmental stages. The researchers argued that better coordination between somatic and psychiatric care could help identify needs earlier, particularly as autistic adolescents move into adult services. Related Swedish research has also shown that psychiatric contact remains common in older autistic adults, reinforcing the case for longer-term mental health support rather than short-term intervention alone.