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Rare kidney & urinary condition

Cystinosis in adults

Cystinosis is a rare storage disease in which cystine crystals accumulate in every cell; children who once died of kidney failure now reach adulthood on cysteamine therapy, needing informed adult multi-organ care.

Key points

The essentials at a glance.

What to look out for, how the diagnosis is confirmed, who looks after it, and the options that exist.

  • 01

    Nephropathic cystinosis presents in infancy with renal Fanconi syndrome; kidney failure follows without treatment.

  • 02

    Lifelong cysteamine (oral, plus eye drops for corneal crystals) depletes cystine and delays every complication - adherence is the central battle.

  • 03

    Most adults have had a kidney transplant; cystinosis does not recur in the graft.

  • 04

    Adult complications: hypothyroidism, diabetes, muscle weakness and swallowing problems, and eye disease - each needs surveillance.

  • 05

    Adult care works best in or alongside specialist metabolic centres; transition from paediatrics is a known danger point for adherence.

Understanding it

What it is, and what happens next.

In plain English - what is going on, how specialists confirm it, and the routes to treatment in the UK.

Cystinosis is a lysosomal transporter defect: cystine cannot exit, crystallises, and slowly poisons cells - kidney tubules first, then thyroid, muscle, eyes and more. The therapeutic story is remarkable - cysteamine turned a fatal childhood disease into a chronic adult one - but the drug is demanding, with strict dosing and side effects, and the crystals resume their work whenever it lapses.

Adults with cystinosis carry a transplant, a demanding medication schedule and a multi-organ surveillance list, and they do best with coordinated care: metabolic or nephrology specialists tracking cystine levels, endocrine and swallowing assessments on schedule, eye drops sustained alongside oral therapy, and honest support around the fatigue and treatment burden that shape adherence. In many parts of the UK, routine NHS outpatient referrals for problems like this can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist knows your history and can tell you which parts apply to you. If in doubt, speak to them.

Published 2026-09-27 · Next review 2027-09-27

Frequently asked

Common questions about Cystinosis in adults.

Quick, plain-English answers to what people ask us most.

  • What is cystinosis?

    Cystinosis is a rare inherited storage disease in which cystine crystals accumulate in every cell of the body; children who once died of kidney failure from this condition can now, with treatment, survive well into adulthood.

  • What causes cystinosis?

    It's caused by an inherited mutation affecting the transport of cystine (an amino acid) out of cell compartments, leading to a build-up of cystine crystals that damage organs, particularly the kidneys.

  • What are the symptoms of cystinosis in adults?

    Adults with cystinosis, having survived childhood kidney complications, can experience ongoing issues including kidney problems, eye involvement, muscle weakness, and, in some cases, other organ effects as the condition progresses over decades.

  • Is cystinosis dangerous?

    Yes, without treatment it historically led to kidney failure in childhood, but with cysteamine treatment and kidney transplantation where needed, many people now live substantially longer, healthier lives into adulthood.

  • Is cystinosis hereditary?

    Yes, it's inherited in an autosomal recessive pattern, meaning both parents carry a faulty gene copy. Genetic counselling and testing are recommended for affected families.

  • Can cystinosis be cured?

    There's no cure for the underlying genetic defect, but cysteamine treatment significantly slows disease progression and organ damage when taken consistently, and kidney transplantation can address kidney failure if it develops.

  • How is cystinosis treated?

    Cysteamine medication (taken orally, and as eye drops for corneal crystal deposits) is the mainstay treatment, alongside monitoring and management of kidney function and other affected organs, often through a specialist multidisciplinary team.

  • How consistently does cysteamine need to be taken?

    Cysteamine needs to be taken very consistently, often multiple times daily, since missed doses allow cystine to re-accumulate quickly - adherence is a genuinely important factor in long-term outcomes.

  • How has the outlook for cystinosis changed over time?

    With modern cysteamine treatment started early and taken consistently, along with kidney transplantation when needed, survival and quality of life have improved dramatically compared with previous decades, when the condition was often fatal in childhood.

  • When should I see a specialist about ongoing cystinosis care?

    Ongoing care should be with a specialist metabolic or renal team experienced in cystinosis. A private specialist consultation for review or a second opinion can often be arranged within about two weeks.