Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
दुर्भिक्षं मरणं रोगं करोति क्षितिजस्तदा ।त्रिषूत्तरासु रोहिण्यां नैर्ऋते श्रवणे मृगे ॥ ३६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 36.
... then Mars may bring famine, risk to life and illness. Mars moving in the three Uttaras, Rohini, Mula, Shravana and Mrigashira ...
Simple meaning: Mars piercing those stars can bring famine, danger to life and illness.
Classical view, not medical advice.
अवृष्टिदश्चरन्भौमो दक्षिणेरोहिणीस्थितः ।
Mars moving in those stars brings no rain. Mars north of the stars brings good.
याम्यगोऽनिष्टफलदो भवेद्भेदकरो नृणाम् ।
Mars going south gives bad results. Mercury never rises without some strange omen.
अनावृष्ट्यग्निभयकृदनर्थनृपविग्रहः ।
Mercury's rising can bring drought, fire fear and war between kings.