the.com/growing pains

The ache of becoming someone you aren't yet, billed as a medical condition.

means The discomfort — physical or organizational — that comes with rapid development, originally the aches once attributed to children's bones and muscles growing.

from Coined in the 19th century as a literal medical term for the leg and joint pains children sometimes feel during growth spurts — doctors debated (and still debate) whether growth itself was really the cause. By the early-to-mid 20th century the phrase had wandered into figurative use, describing the stumbles and strains of any young person, relationship, or company still getting its shape.

actual diagnosis
no known physical cause has ever been confirmed
real culprit
often just ordinary leg fatigue from active kids
the metaphor
outgrew the literal meaning, now means any awkward progress
timing
strikes at night, conveniently when growth cannot be measured
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