Infections
According to the American Association of Neurological Surgeons [6], brain aneurysms may develop as a complication from some types of blood infections. This typically happens if the infection is severe enough to cause damage to arteries in the brain.
Conclusion
Brain aneurysms can be life-threatening if they rupture. If you have risk factors, you should see a doctor for assessment. While treatment options vary with individual peculiarities, procedures such as surgical clipping and endovascular coiling can repair aneurysms. Most people use lifestyle changes to manage the condition.
References
[1] http://www.bafound.org/about-brain-aneurysms/brain-aneurysm-basics/brain-aneurysm-statistics-and-facts/
[2] https://www.mayoclinic.org/diseases-conditions/brain-aneurysm/symptoms-causes/syc-20361483
[3] https://www.mayoclinic.org/diseases-conditions/brain-aneurysm/symptoms-causes/syc-20361483
[4] http://www.bafound.org/about-brain-aneurysms/brain-aneurysm-basics/brain-aneurysm-statistics-and-facts/
[5] https://www.healthline.com/health/aneurysm-in-the-brain
[6] https://www.aans.org/en/Patients/Neurosurgical-Conditions-and-Treatments/Cerebral-Aneurysm