How Adult ADHD Presents
| ADHD Type | Common Adult Presentation |
|---|---|
| Inattentive | Disorganisation, forgetting tasks, losing items, difficulty completing work |
| Hyperactive-Impulsive | Restlessness, talking over others, poor impulse control, risky decisions |
| Combined | Mix of both — most common in adults diagnosed later in life |
Blood Tests to Rule Out Other Causes
Before diagnosing ADHD, doctors investigate medical causes of similar symptoms:
| Test | Rules Out |
|---|---|
| TSH / T4 (thyroid) | Hyperthyroidism causes distractibility, restlessness, poor concentration |
| FBC | Anaemia causes fatigue and poor concentration |
| Vitamin B12 + folate | Deficiency impairs memory and concentration |
| Fasting glucose | Hypoglycaemia episodes can cause brain fog and impulsivity |
| Iron (ferritin) | Low iron impairs dopamine transport — directly related to ADHD symptoms |
| Cortisol | Chronic stress / Cushing's syndrome can mimic ADHD |
Diagnosis in AdultsAdult ADHD diagnosis requires: symptoms present since childhood (even if not formally diagnosed), significant impairment in 2+ settings (work, relationships, finances), and ruling out other conditions. A formal assessment by a psychiatrist or specialist is required for medication.
Evidence-Based Treatments
| Treatment | Notes |
|---|---|
| Stimulants (methylphenidate, lisdexamfetamine) | First-line — most effective; requires specialist prescription |
| Non-stimulants (atomoxetine, guanfacine) | Used if stimulants cause problems or are refused |
| CBT for ADHD | Teaches organisational skills, time management, emotional regulation |
| Coaching | Practical support for daily functioning |
| Sleep optimisation | Poor sleep dramatically worsens ADHD symptoms |
Can you develop ADHD as an adult?
ADHD is a neurodevelopmental condition present from childhood. Adults diagnosed later always had it — it was often masked by high intelligence, family support, or structured school environments.
Do stimulant medications for ADHD cause addiction?
When taken as prescribed, stimulants do not cause addiction in people with ADHD. In fact, untreated ADHD is a much stronger risk factor for substance abuse than the medications used to treat it.
Is ADHD just a trendy diagnosis?
No. ADHD has robust neurobiological evidence, with consistent differences in brain structure and function, and strong heritability (75%). The rise in diagnoses largely reflects better recognition, especially in women and adults.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.