Persistent pruritus points to a hidden malignancy

Nick, a 28-year-old male, presents with a primary complaint of generalised itching for the past 3-4 weeks.
He reports no accompanying rash and denies recent use of new skin care or laundry products.
The itch is relatively constant throughout the day and night — occasionally disrupting his sleep.
Nick denies other symptoms, including rhinitis, abdominal pain, lip or eyelid swelling, night sweats, weight loss or fevers.