A bull market is a period when share prices are rising broadly and investor confidence is high. A bear market is a period when prices are falling broadly, usually by 20% or more from a recent peak, and pessimism spreads. These two terms describe the overall direction and mood of the market.
What bull and bear markets are
The names are often explained by how the animals attack: a bull thrusts its horns upwards, while a bear swipes its paws downwards. A widely used rule of thumb is that a fall of 20% or more from a recent high in a major index marks a bear market. A fall of about 10% is usually called a correction. A bull market is a sustained rise, often lasting years, during which most stocks gain.
How it works in India
In India, investors usually judge market direction by the Nifty 50 and the Sensex. Bull markets have often been driven by strong economic growth, rising company profits, falling interest rates and heavy inflows of money from domestic and foreign investors. Bear markets have often followed global crises, sharp rises in interest rates, economic slowdowns or major uncertainty. India's markets have seen several sharp falls, such as during the 2008 global financial crisis and the 2020 pandemic shock, each followed later by a recovery.
A simple example
An index rises from 10,000 to 15,000 over three years, with most companies participating: that is a bull market. Then it falls from 15,000 to 11,500, a decline of about 23%: that is a bear market. If it had fallen only to 13,500, a decline of 10%, it would usually be called a correction.
Why it matters for investors
Understanding market phases helps you stay calm during falls, avoid excessive optimism during booms, and keep a long-term view. History shows that both bull and bear markets end eventually, but nobody can reliably predict when.
How investors often behave in each phase
In bull markets, rising prices can encourage overconfidence: investors take more risk, chase popular stocks and expect gains to continue. In bear markets, fear can push investors to sell good investments at low prices. Both reactions are natural and both can hurt returns. Many long-term investors prefer to follow a plan, for example investing regularly through a systematic investment plan (SIP), keeping a diversified portfolio and reviewing it periodically, rather than reacting to every market move.
Signs people watch
Investors often watch broad indices, the number of stocks rising versus falling, interest rates, inflation, company earnings and investment flows from institutions. None of these predicts turning points reliably, but together they help explain the market's mood.
Example on PositoAI: the Hang Seng index, Hong Kong
Indices and individual shares can be in very different places. On 19 Oct 2026, of the 94 Hang Seng companies on PositoAI, 62 (about two in three) were 20% or more below their 52-week high, in a "bear market" of their own. Another 18 were 10–20% below, 6 were 5–10% below, and only 8 were within 5% of their high. It is a reminder that "the market" is made of many companies, each with its own trend.
Common misconceptions
"I can time the market." Predicting the exact start or end of bull and bear markets is extremely difficult, even for professionals.
"All stocks rise in a bull market." Many do, but some fall even in strong markets.
"A bear market means I should sell everything." Selling in panic can lock in losses; decisions should follow your goals and time horizon.
Frequently asked questions
How long do bear markets last?
It varies widely, from a few months to a few years.
What is a correction?
A fall of about 10% from a recent high, smaller than a bear market.
Can individual stocks be in a bear market?
Yes, a single stock can fall 20% or more even when the overall market is rising.
What causes bull markets?
Often a combination of economic growth, rising profits, supportive interest rates and investor confidence.
How to use this on PositoAI
Follow the Nifty 50 and Sensex companies on Senty, see large institutional deals on Flows, and use your Watchlist to track chosen companies through every market phase. PosiStep 6 of PosiCourse, PositoAI's free stock market course, explains indices and market moods.
Summary
A bull market is a sustained period of rising prices and optimism; a bear market is a broad fall of about 20% or more from a recent high, with pessimism. A 10% fall is usually called a correction. In India, the Nifty 50 and Sensex are the main guides. Both phases end eventually, but their timing cannot be predicted reliably, so a long-term, goal-based approach matters.