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Abstract Background Knowledge of the frequency of precipitating factors for acute heart failure (AHF) is important (either new-onset heart failure [NOHF] or worsening heart failure [WHF]), as this can guide strategies for prevention and treatment. Most data come only from Western Europe and North America; nevertheless, geographic differences do exist. We set out to study the prevalence of precipitating factors of AHF and their connection to patient characteristics and in-hospital and long-term mortality in patients from Egypt hospitalized for decompensated HF. Using the ESC-HF-LT Registry which is a prospective, multicenter, observational study of patients confessed to cardiology centers in the nations of Europe and the Mediterranean, patients presenting with AHF were recruited from 20 centers all over Egypt. Enrolling physicians were requested to report possible precipitants from among several predefined reasons. Results We included 1515 patients (mean age 60 ± 12 years, 69% males). The mean LVEF was 38 ± 11%. Seventy-seven percent of the total population had HFrEF, 9.8% had HFmrEF, and 13.3% had HFpEF. The commonly reported precipitating factors for AHF hospitalization among study population were as follows (in decreasing order of frequency): infection in 30.3% of patients, acute coronary syndrome/myocardial ischemia (ACS/MI) in 26%, anemia in 24.3%, uncontrolled hypertension in 24.2%, atrial fibrillation (AF) in 18.3%, renal dysfunction in 14.6%, and non-compliance in 6.5% of patients. HFpEF patients had significantly higher rates of AF, uncontrolled hypertension, and anemia as precipitants for acute decompensation. ACS/MI were significantly more frequent in patients with HFmrEF. WHF patients had significantly higher rates of infection and non-compliance, whereas new-onset HF patients showed significantly higher rates of ACS/MI and uncontrolled hypertension. One-year follow-up revealed that patients with HFrEF had a significantly higher rate of mortality compared to patients with HFmrEF and HFpEF (28.3%, 19.5, and 19.4%, P = 0.004). Patients with WHF had a significantly higher rates of 1-year mortality when compared to those with NOHF (30.0% vs. 20.3%, P