Neurasthenia was attributed to modern life, not heredity.

Evidence

In fact, neurasthenia appeared more as a form of nervous fatigue resulting from modern life than as a form of degeneration: the social factor became etiology’s first preoccupation. — Alain Ehrenberg, The Weariness of the Self, 213

Categorization

• recurring: this claim recurs 2 times within its source
• XREF: connects to: Neurasthenia explained France’s defeat in the 1870 war. — Alain Ehrenberg, The Weariness of the Self: Diagnosing…, 215