Cardiovascular

• Hypertension (very common at this age)
• Coronary artery disease / early atherosclerosis
• Dyslipidemia
• Arrhythmias (e.g., atrial fibrillation)
• Cardiomyopathy

Metabolic / Endocrine

• Type 2 diabetes mellitus
• Metabolic syndrome
• Obesity
• Hypothyroidism / hyperthyroidism
• Gout (uric acid buildup peaks in middle-aged men)

Gastrointestinal

• GERD / peptic ulcer disease
• Irritable bowel syndrome (IBS)
• Non-alcoholic fatty liver disease (NAFLD)
• Colorectal polyps (screening starts at 45, but risk rises earlier)
• Hemorrhoids

Musculoskeletal

• Osteoarthritis (early onset, especially knees/hips)
• Lower back pain / disc herniation
• Tendinopathy (rotator cuff, Achilles)
• Gout

Neurological / Mental Health

• Depression and anxiety (peak incidence in middle age)
• Migraines
• Sleep apnea (very common in men this age)
• Early burnout/stress disorders
• Alcohol use disorder

Urological / Reproductive

• Benign prostatic hyperplasia (BPH - early stages)
• Erectile dysfunction
• Kidney stones (highest incidence in men aged 30-50)
• Hypogonadism / low testosterone

Respiratory

• Asthma
• Chronic bronchitis / early COPD (especially if smoker)
• Obstructive sleep apnea

Dermatological

• Seborrheic dermatitis
• Acne rosacea
• Androgenetic alopecia
• Skin cancer risk (especially with sun exposure history)

Oncological (rising risk)

• Testicular cancer (though peak is 20s-30s, still relevant)
• Colorectal cancer
• Skin cancers (basal cell, squamous cell, melanoma)
• Lymphoma

Eye / ENT

• Presbyopia (near-vision changes often begin around 40)
• Hearing loss (early noise-induced)
• Sinusitis