Get help now — free helplines

You can call any of these for free. You do not need a diagnosis, an appointment, or a crisis to call — questions and plain exhaustion are reasons enough.

  • Alzheimer's Association 24/7 Helpline 800-272-3900 24 hours a day, 365 days a year Free, confidential support and information for people with dementia, caregivers, families and the public. Master's-level clinicians. Also Spanish.
  • 988 Suicide & Crisis Lifeline 988 24/7 Call or text 988, or chat at 988lifeline.org. For anyone in emotional distress or a mental-health crisis, including caregivers.
  • Alzheimer's Foundation of America (AFA) Helpline 866-232-8484 9:00 am - 9:00 pm ET, seven days a week Licensed social workers providing support, info and referrals. Also text message and web chat. Text: 646-586-5283

In a medical emergency, call 911. More numbers, and what each line does, on the help page.

Each study has a usefulness score out of 100 (rubric version 4.0). Tap a score to see what makes it up.

Highest usefulness score first. Studies without a score come last.

  1. Biomonitoring and biomarkers of organophosphate pesticides exposure - state of the art

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Annals of agricultural and environmental medicine : AAEM 2011-01-01 Risk factors

    Human biomonitoring provides an efficient and cost-effective way to identify and quantify exposure to chemical substances, including those having deleterious eff ects on human organisms.

  2. Oxidative stress caused by ozone exposure induces loss of brain repair in the hippocampus of adult rats

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicological sciences : an official journal of the Society of Toxicology 2009-10-15 Biomarkers

    Oxidative stress is involved in many neurodegenerative diseases.

  3. Air pollution: mechanisms of neuroinflammation and CNS disease

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Trends in neurosciences 2009-08-26 Risk factors

    Air pollution has been implicated as a chronic source of neuroinflammation and reactive oxygen species (ROS) that produce neuropathology and central nervous system (CNS) disease.

  4. Genetics, environmental factors and the emerging role of epigenetics in neurodegenerative diseases

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Mutation research 2008-10-31 Risk factors

    In the present review we summarize recent advances in the understanding of the interaction between genetics and environmental factors involved in complex multi-factorial neurodegenerative disorders such as Alzheimer's disease (AD), Parkinson's disease (PD) and Amyotrophic Lateral Sclerosis (ALS).

  5. Environmental-induced oxidative stress in neurodegenerative disorders and aging

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Mutation research 2008-10-05 Risk factors

    The aetiology of most neurodegenerative disorders is multifactorial and consists of an interaction between environmental factors and genetic predisposition.

  6. The effects of environmental neurotoxicants on the dopaminergic system: A possible role in drug addiction

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Biochemical pharmacology 2008-05-20 Risk factors

    Humans are routinely exposed to a vast array of environmental neurotoxicants, including pesticides, endocrine disrupters, and heavy metals.

  7. Nanomaterials and nanoparticles: sources and toxicity

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Biointerphases 2007-12-01 Risk factors

    Significantly, technological advancement has also changed the character of particulate pollution, increasing the proportion of nanometer-sized particles--"nanoparticles"--and expanding the variety of chemical compositions.

  8. Effects of PM2.5Collected from Cache Valley Utah on Genes Associated with the Inflammatory Response in Human Lung Cells

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Journal of Toxicology and Environmental Health 2007-09-13 Risk factors

    In January 2004, the normally picturesque Cache Valley in northern Utah made national headlines with the highest PM2.5 levels in the nation.

  9. New and evolving concepts in the neurotoxicology of lead

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicology and applied pharmacology 2007-08-16 Disparities

    Experimental studies have shown that stress can significantly alter the effects of Pb, effects that could potentially be mediated through alterations in the interactions of glucocorticoids with the mesocorticolimbic dopamine system of the brain.

  10. Epidemiologic studies of environmental exposures in Parkinson's disease

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Journal of the neurological sciences 2007-07-27 Risk factors

    Parkinson's disease (PD) is the most common cause of the parkinsonian syndromes and the most frequent neurodegenerative disease after Alzheimer's disease.

  11. Environmental and dietary risk factors in Alzheimer's disease

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Expert review of neurotherapeutics 2007-07-01 Risk factors

    Alzheimer's disease (AD) is a progressive neurodegenerative disease that affects millions in the aging population worldwide and will affect millions more in the next 20 years.

  12. Pediatric respiratory and systemic effects of chronic air pollution exposure: nose, lung, heart, and brain pathology

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicologic pathology 2007-01-01 Risk factors

    Exposures to particulate matter and gaseous air pollutants have been associated with respiratory tract inflammation, disruption of the nasal respiratory and olfactory barriers, systemic inflammation, production of mediators of inflammation capable of reaching the brain and systemic circulation of particulate matter.

  13. Serine hydrolase targets of organophosphorus toxicants

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Chemico-biological interactions 2005-10-21 Risk factors

    Acetylcholinesterase (AChE) is one of several hundred serine hydrolases in people potentially exposed to about 80 organophosphorus (OP) compounds important as insecticides or chemical warfare agents.

  14. Copper, oxidative stress, and human health

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Molecular aspects of medicine 2005-08-01 Risk factors

    Copper (Cu), a redox active metal, is an essential nutrient for all species studied to date.

  15. Deaths: leading causes for 2002

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. PubMed 2005-03-07 Disparities

    In 2002, the 10 leading causes of death were (in rank order) Diseases of heart; Malignant neoplasms; Cerebrovascular diseases; Chronic lower respiratory diseases; Accidents (unintentional injuries); Diabetes mellitus; Influenza and pneumonia; Alzheimer's disease; Nephritis, nephrotic syndrome and nephrosis; and Septicemia and accounted for about 79 percent of all deaths occurring in the United States.

  16. Metals, toxicity and oxidative stress

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Current medicinal chemistry 2005-01-01 Risk factors

    Common mechanisms involving the Fenton reaction, generation of the superoxide radical and the hydroxyl radical appear to be involved for iron, copper, chromium, vanadium and cobalt primarily associated with mitochondria, microsomes and peroxisomes.

  17. Brain inflammation and Alzheimer's-like pathology in individuals exposed to severe air pollution

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicologic pathology 2004-11-01 Risk factors

    Air pollution is a complex mixture of gases (e.g., ozone), particulate matter, and organic compounds present in outdoor and indoor air.

  18. Deaths: leading causes for 2001

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. PubMed 2003-11-07 Disparities

    In 2001, the 10 leading causes of death were (in rank order) Diseases of heart; Malignant neoplasms; Cerebrovascular diseases; Chronic lower respiratory diseases; Accidents (unintentional injuries); Diabetes mellitus; Influenza and pneumonia; Alzheimer's disease; Nephritis, nephrotic syndrome and nephrosis; and Septicemia and accounted for nearly 80 percent of all deaths occurring in the United States.

  19. DNA damage in nasal and brain tissues of canines exposed to air pollutants is associated with evidence of chronic brain inflammation and neurodegeneration

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicologic pathology 2003-09-01 Risk factors

    Acute, subchronic, or chronic exposures to particulate matter (PM) and pollutant gases affect people in urban areas and those exposed to fires, disasters, and wars.

  20. Synergistic effects of pesticides and metals on the fibrillation of alpha-synuclein: implications for Parkinson's disease

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Neurotoxicology 2002-10-01 Risk factors

    Aggregation of alpha-synuclein has been implicated in the formation of proteinaceous inclusions in the brain (Lewy bodies, Lewy neurites) that are characteristic of neurodegenerative diseases, such as Parkinson's disease (PD) and dementia with Lewy bodies (DLBs).

  21. Deaths: leading causes for 2000

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. PubMed 2002-09-16 Disparities

    In 2000 the 10 leading causes of death were (in rank order) Diseases of heart; Malignant neoplasms; Cerebrovascular diseases; Chronic lower respiratory diseases; Accidents (unintentional injuries); Diabetes mellitus; Influenza and pneumonia; Alzheimer's disease; Nephritis, nephrotic syndrome and nephrosis; and Septicemia and accounted for nearly 80 percent of all deaths occurring in the United States.

  22. Air pollution and brain damage

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Toxicologic pathology 2002-05-01 Risk factors

    Exposure to complex mixtures of air pollutants produces inflammation in the upper and lower respiratory tract.

  23. Neurodegenerative diseases: occupational occurrence and potential risk factors, 1982 through 1991

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. American journal of public health 1996-09-01 Risk factors

    Neurodegenerative disease occurs more frequently in some occupations than in others, and this distribution, which may indicate occupational risk factors, should be further investigated.

  24. Can the controversy of the role of aluminum in Alzheimer's disease be resolved? What are the suggested approaches to this controversy and methodological issues to be considered?

    ✓ Peer-reviewed alzhub usefulness score 36 out of 100. Journal of toxicology and environmental health 1996-08-01 Risk factors

    Hyper-aluminemia often develops in patients with renal failure being treated with intermittent hemodialysis on a chronic basis, and in severe cases results in an encephalopathy.

  25. Heat-related mortality by comorbidity and cause of death: a time-stratified case-crossover study of 3.7 million deaths in Brazil, 2014–2025

    ⚠ Preprint — not yet peer-reviewed alzhub usefulness score 16 out of 100. Research Square 2026-10-22 Risk factors

    Because deaths without a given condition differ in cause composition from deaths with it, each condition was also compared with deaths carrying another of the studied conditions: the dementia estimate strengthened to 1.050 (1.036–1.065), and cerebrovascular disease reached 1.018 (1.009–1.027), a smaller but statistically robust positive modification.

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