Global cocoa prices have hit a fresh record high as dry weather hurts crops in West Africa.
Cocoa prices on the New York commodities market reached a new all-time high of $5,874 (£4,655) a ton on Thursday.
The cost of the key ingredient for making chocolate has now roughly doubled since the start of last year.
Soaring cocoa prices are already filtering through to consumers and squeezing major chocolate makers.
On Thursday, one of the world’s biggest chocolate manufacturers Hershey warned: “Historic cocoa prices are expected to limit earnings growth this year.”
The company’s chief executive Michele Buck also did not rule out putting up prices for customers.
“We can’t talk about future pricing,” she said in a call with analysts but added, “given where cocoa prices are, we will be using every tool in our toolbox, including pricing, as a way to manage the business.”
Last month, Mondelez, the company behind the Cadbury brand, identified rising costs of ingredients as one of the challenges it faced in the year ahead.
Chief financial officer Luca Zaramella said the firm had seen “significant increases in both cocoa and sugar”.
In December, UK consumer group Which? said the price of some festive chocolate boxes had risen by at least 50% in a year.
While overall inflation for UK supermarket food and drink eased in November to 8.3%, the rise in the chocolate prices was significantly higher at 15.3%.
Cocoa prices have been driven up by poor harvests in West Africa, which produces the bulk of global supply.
The El Niño weather phenomenon has been causing drier weather in Ghana and Ivory Coast, which are the world’s two biggest producers of cocoa beans.